a sheath, case, or cover designed to fit over an object for protection or decoration

a conventional method or formula; a fixed format or routine phrase

a ring-shaped object or loop made of rope or wire

cotton wadding or batting used inside clothes or quilts; also called 棉花套子 mián​huā​tào​zi

(colloquial) a condom

a coordinated set of movements in martial arts

a snare, trick, or scheme intended to deceive someone