keep back phr v 1 [T keep sth ↔ back] to not tell someone about something 隐瞒，不告诉: I know she was keeping something back from me. 我知道她在对我隐瞒着什么。 2 [I,T keep sb ↔ back] to not go close to something, or make someone do this 不靠近，（使）远离: Police ordered the crowds to keep back. 警方命令人群不许靠近。