backfieldKK [ˋbæˏkfild] /ˈbæˌkfild/名詞1後衛群、後場球員美式足球Their backfield is fast enough to break through any defense.他們的後衛群速度夠快,任何防線都擋不住。2後場、進攻線後方區域美式足球The quarterback dropped deep into the backfield before throwing.四分衛退到後場深處才把球傳出去。