expression, godan verb (-su)
square one's shoulders; throw one's shoulders back
Idiomatic expression describing a deliberate, often intimidating posture; used when someone puffs up or squares their shoulders to appear bigger or more confident. Compare 肩をいからせる.
See also: 肩をいからせる
彼は相手を威圧しようと肩をそびやかした。
He squared his shoulders to intimidate his opponent.
社長の前で肩をそびやかすのはやめたほうがいい。
You'd better not throw your shoulders back in front of the president.