ふんぞり返る

ふんぞりかえるfunzorikaeru

godan verb · intransitive

1. to straighten up and stick one's chest out
2. to throw oneself back (e.g. in a chair)
3. to lean back (arrogantly)
4. to assume a haughty attitude
5. to behave arrogantly

Study it in Yanamino