To enlist in military service
应征入伍
She mustered in at the age of 18.
她18岁时入伍
To leave or be discharged from military service
离开军队
He mustered out when the war ended.
战争结束时他退伍了
be accepted as adequate or satisfactory
被认为合格，被认为可以通得过
this manifesto would not pass muster with the voters.
选民们对这个宣言不满意。
(US)enrol someone into (or discharge someone from) military service
(美)征召…入伍；令…退伍