The Redskins gave up on wide receiver Charlie Brown for at least another month yesterday when he was placed on the team's ever-swelling injured-reserve list along with center Jeff Bostic, who is out for the year after undergoing knee surgery Monday.

Brown, the team's leading receiver in 1983, has been plagued by hamstring and ankle injuries nearly the entire season. He suffered what was thought to be a sprained ankle against the Eagles in the fifth week, but the injury was diagnosed last week as a stress fracture. Then, it was thought he would miss between one and three weeks.

Brown tried to run during practice Monday "and he was really having trouble," said Joe Bugel, the Redskins' assistant head coach for offense. "The poor kid could hardly run. Joe (Gibbs) called him in today, and Charlie said it was just real sore and he knew he couldn't play on it for a while. He (Brown) thought it (injured reserve) was a good idea. Four weeks, he'll be okay."

Brown could not be reached for comment last night.

The acquisition of Calvin Muhammad from the Los Angeles Raiders three weeks ago has relieved some of the pressure on a team receiving corps now missing four of its top five pass-catchers of 1983 (Brown; Alvin Garrett and Joe Washington, both injured, and Nick Giaquinto, retired).

Bostic's loss for the season had been expected after he underwent surgery to repair three torn knee ligaments and one torn cartilage. The Redskins moved quickly to beef up their offensive line and special teams yesterday by signing former New York Giants guard J.T. Turner and guard-center Bruce Kimball, who was on the active roster in 1983.

The addition of the two linemen marked the Redskins' 16th and 17th roster moves this season. And they now have had 26 players on injured reserve since training camp, 13 since the start of the regular season.