From Longman Dictionary of Contemporary Englishget off lightlyget off lightly (also be let off lightly)STRICT to be punished in a way that is less severe than you deserve He got off lightly because his father was a lawyer. → lightly
Examples from the Corpus
get off lightly• I'm letting you off lightly this time, but next time you could end up in jail.• But that doesn't mean that the person responsible should be allowed to get off lightly.• Mind you, Little Liz got off lightly.• Reno got off lightly compared to Curran.• You got off lightly in the alley tonight.• Bill Stubbly had got off lightly - so far.• Really she was getting off lightly with a few glasses of bleach.• He'd got off lightly with the men earlier. 