We found one dictionary that defines the word blow off one's steam:

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1. blow off one's steam: Wiktionary

Definitions from Wiktionary (blow off one's steam) ▸ verb:  (uncommon) Synonym of blow off steam ▸ Words similar to blow off one's steam ▸ Usage examples for blow off one's steam ▸ Idioms related to blow off one's steam ▸ Wikipedia articles (New!) ▸ Words that often appear near blow off one's steam ▸ Rhymes of blow off one's steam ▸ Invented words related to blow off one's steam