square one's shoulders (I squared the shoulders and strode to the door, like Childe Roland about to fight the paynim." (P.G. Wodehouse ART Vancouver); set back one's shoulders; square shoulders; straighten one's shoulders; throw back one's shoulders; open out one's shoulders (Already after several severe blows he opened out his shoulders and made them run away)

shrug (в переводе названия книги Айн Рэнд "Atlas Shrugged" – "Атлант расправил плечи")

расправить плечи