fluff one's feathers
verb1
To show off.
- He knew, though, that the man wasn't thinking of violence. Instead, he was fluffing his feathers for Thessa and doing a little blustering dance.2014, Liz Tyner, A Captain and a Rogue, page 72:
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.