dominant arm; one's stronger arm
Refers to the arm a person naturally uses for writing, throwing, etc. Often used in contexts like sports, daily tasks, or injury.
He broke his dominant arm and wrote with his left hand for a while.
In baseball, you wear the glove on the hand opposite your throwing arm.
Standard kanji spelling.
Less common variant; 利き腕 is more frequent.
Compound of 利き (kiki, 'effective, working') + 腕 (ude, 'arm'). The exact historical derivation is uncertain, but the word transparently means 'the arm that works well'.