弹簧

spring

crossball / bullet / shot / shell / ball

to pluck (a string) / to play (a string instrument) / to spring or leap / to shoot (e.g. with a catapult) / (of cotton) to fluff or tease / to flick / to flip / to accuse / to impeach / elastic (of materials)

metallic reed / spring of lock

spring lock

swing door

flick knife / switchblade / spring-loaded knife

spring balance

spring washer