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Difference between Let off steam and Put on steam

let off steam—(also: blow off steam) give vent to one’s repressed emotions (by talking in an unrestrained manner, etc.):

  • This special session will give politicians a chance to let off steam.

put on steam—(also: get up steam) build up strength or energy; become more active:

  • Get on a little faster; put a little more steam on, ma’am, pray.