noun螺丝钉,螺丝
verb用螺丝固定;旋紧,拧紧;把…揉成团
nouna small metal thing with a sharp end, that you use for fixing things together. You push it into something by turning it with a special tool (called a screwdriver).
verbto fix something to another thing using a screw
verbto turn something to fix it to another thing
verbto make paper or material into a ball with your hand