join up
柯林斯词典
1. PHRASAL VERB If someone joins up, they become a member of the army, the navy, or the air force. 参军
When hostilities broke out he joined up. 战争爆发后,他参了军。
2. PHRASAL VERB If one person or organization joins up with another, they start doing something together. 与…联手
Dwight decided to withdraw from the committee and join up with the opposition. 德怀特决定退出该委员会并和反对派联手。
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