In a rare statement on Sept. 22, North Korean leader Kim Jong Un called President Trump a "mentally deranged U.S. dotard," vowing to "tame him" with fire. On Sept. 19, Trump threatened to "totally destroy" North Korea in front of the United Nations General Assembly. (Reuters)

In the latest war of words between the United States and North Korea, Kim Jong Un did not pull any punches.

But he may have pulled out an old dictionary.

“I will surely and definitely tame the mentally deranged U.S. dotard with fire,” Kim declared in an unusually direct and angry statement published Thursday by North Korea’s official Korean Central News Agency.

The North Korean leader’s warning about “fire,” which echoed President Trump’s August statement threatening “fire and fury,” was par for the course in the increasingly tense relationship. On Thursday, Trump announced new financial sanctions to further isolate the country as its nuclear and ballistic missile capabilities rapidly escalate.

But Kim’s use of “dotard” was what raised eyebrows, prompting people around the world to Google the old-time insult.

Merriam-Webster defines the noun as “a person in his or her dotage,” which is “a state or period of senile decay marked by decline of mental poise and alertness.”

Oxford’s definition: “An old person, especially one who has become weak or senile.”

It’s pronounced dō-tərd (as in DOE-turd), and searches for the term spiked following Kim’s statement, Merriam-Webster noted.

The word meant “imbecile” when it was first used in the 14th century and comes from the Middle English word “doten,” meaning “to dote,” according to Merriam-Webster.

It was used by Chaucer in “The Canterbury Tales” and appeared numerous times in William Shakespeare’s work, including “The Taming of the Shrew” and “King Lear.”

In the book “Shakespeare’s Insults: A Pragmatic Dictionary,” dotard is “linked to French radoter, which means to repeat things several times because one forgets.”

J.R.R. Tolkien was also fond of “dotard,” which was a popular pejorative in literature — and beyond: The word was used to insult Andrew Jackson, one of Trump’s White House heroes, and by Union Army Gen. George McClellan to describe his Civil War predecessor, Gen. Winfield Scott, whom he did not like.

A front-page story in the July 25, 1854, edition of the New York Daily Times notes that one member of Congress (Sen. John Pettit) referred to another (Rep. Thomas Hart Benton) as a dotard.

But the word has fallen out of favor.

According to Google’s Ngram Viewer, which can search for words printed between 1500 and 2008, use of “dotard” spiked in Shakespeare’s time, then surged again in the 1800s before falling out of favor.

Now, thanks to Kim, “dotard” is back.

Kim used the insult not once but twice in his statement, which was a response to Trump’s address Tuesday to the United Nations General Assembly, during which the U.S. president called Kim “Rocket Man” and threatened to “totally destroy North Korea.”

Here is the first time Kim uses the term:

“Action is the best option in treating the dotard who, hard of hearing, is uttering only what he wants to say.”

And the second:

“I will surely and definitely tame the mentally deranged U.S. dotard with fire.”

While the English version of Kim’s statement calls Trump a “dotard,” the Korean version actually calls him a “lunatic old man,” according to Anna Fifield, The Washington Post’s Tokyo bureau chief who covers North Korea.

An Associated Press reporter who was once based in Pyongyang noted on Twitter that she’d been inside the Korean Central News Agency newsroom, where “they’re using very old Korean-English dictionaries,” which might explain how the arcane word wound up back in the news.

According to the AP, “dotard is a translation of a Korean word, ‘neukdari,’ which is a derogatory reference to an old person.”

Sometimes, it is translated into the neutral “old people” or omitted, depending on the context or the importance of the statement. KCNA last used the word in February to describe supporters of ousted South Korean President Park Geun-hye, whom it also called “neukdari” and a “prostitute.” Before that, KCNA called Park’s conservative predecessor, Lee Myung-bak, “the traitor like a dotard.”

So why did KCNA use the word again?

It may have simply resorted to a Korean-English dictionary. Putting “neukdari” into a popular online Korean-English dictionary in South Korea returns two English equivalents: an “aged (old) person” and a “dotard.”

It’s worth noting that Thursday wasn’t the first time anybody had referred to Trump as a dotard.

In May, writing in Esquire, Charles P. Pierce described the president as “a blundering dotard.”

On Thursday, Pierce tipped his cap to the North Koreans.

Other Twitter users, predictably, had some fun with the suddenly trending term.

Mark Dice, a conservative media analyst, tweeted that “liberals are now siding with North Korea after he called Trump a #dotard (meaning an old, senile person). That figures. Liberals hate us.”

He added an American flag emoji to his tweet.

A previous version of this post said that Martin Van Buren had been called a dotard. While it’s possible that he was — at some point, by somebody — the specific reference cited was to Andrew Jackson. The post has been corrected and updated.

Read more:

Dotard? How about crapulous, gormless or snoutband? Our guide to underused insults.

Trump imposes new sanctions on North Korea; Kim says he will ‘tame the mentally deranged U.S. dotard with fire’

North Korean leader on Trump: ‘I will surely and definitely tame the mentally deranged U.S. dotard with fire’