smooth one's / sb's (ruffled) feathers

to make oneself (or somebody else) feel less irritated or offended

Lacon was no fool, and the Cousin's wrath just when everyone was trying to smooth their feathers was a thing to be avoided at any cost.
John le Carré: The Honourable Schoolboy.CORONET BOOKS, Hodder & Stoughton, 2000. p. 63.

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