Sports Of, relating to, or being a member of the first string of a team.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "first-string" in a sentence
"The first-string couldn't get in the end zone in the last two intrasquad scrimmages against the defense."
"As a former first-string critic and current Drama Desk member, the protocol breach represents an important opportunity to review how utterly outmoded the protocol really is."
"That is first-string, varsity material on Team Tea Party right there."