noun, noun or participle which takes 'suru', intransitive verb
folding one's arms; crossing one's arms
Describes the physical action of crossing one's arms in front of the chest. Often used with する to mean 'to fold one's arms'. Can imply a thoughtful or defiant posture depending on context.
彼は腕組みをして考え込んだ。
He folded his arms and thought deeply.
先生は腕組みしながら生徒
The teacher listened to the students' presentations with his arms crossed.