fall behind, lag behind
你看,你都掉队了
Look, you’ve fallen behind.
— Lost in Thailand (2012)
跑步时掉队
Fall behind while running.
— 好人寥寥 (1992)
他可能掉队,
He might fall behind.
— 潜行者 (1979)
对啊,我不是掉队了么
Yeah, didn't I fall behind?