noun
stripping to the waist; baring the upper body
Describes the action or state of removing clothing from the upper body, often in a vigorous or determined manner. Can be used literally or figuratively for wholehearted effort.
祭りで男たちがもろ肌脱ぎになって神輿を担いだ。
At the festival, the men stripped to the waist and carried the portable shrine.
彼はもろ肌脱ぎで仕事に取り組んだ。
He threw himself wholeheartedly into the work.
肌脱ぎ also means stripping to the waist, but もろ肌脱ぎ emphasizes baring both shoulders completely, often with a connotation of vigorous effort.
Compound of もろ (both) + 肌 (skin) + 脱ぎ (removing), literally 'removing clothing from both shoulders'.