1. do or say something that allows you to get rid of pent up emotions or frustration
let/blow off some steam in the meeting
When you 'let off steam' or 'blow off steam' it means to do something in order to help manage strong feelings emotions or a large amount of energy. Usually, when you 'let off steam' or 'blow off steam' you are doing something constructive rather than behaving in a way that expresses your anger or frustration or another negative feeling. This is a casual expression usually used in social contexts.