1. （为逃避警方或敌人追捕）在逃，逃匿
If someone is on the lam or if they go on the lam, they are trying to escape or hide from someone such as the police or an enemy.
1. a rapid escape (as by criminals)
e.g. the thieves made a clean getaway
after the expose he had to take it on the lam
Synonym: getaway