1.
resting one's chin in one's hand, chin-in-hand
The posture of propping one's chin or cheek on one's hand, typically with the elbow on a table. Can suggest boredom, deep thought, or idle relaxation.
頬杖をつく。
To rest one's chin in one's hand.
The posture of resting one's cheek or chin on one's hand, typically with the elbow on a table or desk.
Forms
頬 (cheek) + 杖 (cane/prop) — literally "a prop for the cheek."
Usage
Almost always appears with the verb つく: 頬杖をつく (to rest one's chin on one's hand). The gesture can suggest boredom, absent-mindedness, or deep thought.
Cultural note
Considered bad posture in Japan. Students are often told not to do this during class (授業中), and it can appear rude or inattentive in meetings and formal settings.
Related Words
Related:
頬 (cheek)