ˌsecond-ˈstring adjectiveadj [only before noun] UNIMPORTANTnot regularly part of a team, group etc, but sometimes taking someone else’s place in it 〔队、组等成员〕替补的，二线的 the Vikings’ second-string quarterback 北欧海盗队的替补四分卫
second-string• She watches her lead the second-string players as they widen the margin of victory to thirty-nine points.