noun, noun which may take the genitive case particle 'no'
Refers to a single arm, often in contexts of physical ability or disability.
He lifted the heavy luggage with one arm.
right-hand man; trusted assistant
Figurative use for a person who is indispensable support, like a right arm.
He supports the company as the president's right-hand man.
Compound of 片 (kata, 'one side') and 腕 (ude, 'arm').