noun
square shoulders; broad shoulders
Describes shoulders that are broad and square, often giving an impression of strength or an imposing presence.
彼は怒り肩で、スーツがよく似合う。
He has square shoulders and looks good in a suit.
撫で肩 means 'sloping shoulders', the opposite of 怒り肩.
Compound of 怒り (ikari, 'anger') and 肩 (kata, 'shoulder'), literally 'angry shoulders', referring to the raised, square appearance of the shoulders when one is angry or tense.