From Longman Dictionary of Contemporary Englishlet somebody/something off phrasal verb1 PUNISHto not punish someone I’ll let you off this time, but don’t do it again. with After checking our identities, the customs men let us off with a warning.let somebody off the hook (=allow someone to escape punishment or criticism) He’d decided to make Sandra wait before letting her off the hook.let somebody off lightly/easily (=give someone a less serious punishment than they deserve) I think young criminals are let off far too lightly.2 let somebody off (something)LET/ALLOW if someone in authority lets you off something you should do, they give you permission not to do it You’ve worked hard all week, so I’ll let you off today.3 let something ↔ offSHOOT to make something explode One boy had let off a firework in class. → let/blow off steam at steam1(4) → let→ See Verb table
Examples from the Corpus
let with• But she refused to let him off with insinuations. 