"腕を組む" (Umu o kumu) is a Japanese phrase that translates to "crossing one's arms." This gesture is often used to convey various emotions, such as defensiveness, contemplation, or even comfort. People may cross their arms when they are deep in thought or feeling uncertain about a situation. In social contexts, crossing arms can also indicate a closed-off attitude or a lack of openness. However, it is essential to consider cultural differences, as the meaning of this gesture can vary. In some cultures, it may simply be a comfortable resting position rather than a sign of negativity.