tapper

中文： 踢踏舞者、窃听者、敲击者

1. One who makes a tapping noise.
2. A tap-dancer.
3. A wiretapper.
4. A weakly hit ground ball. (slang)
5. In early wireless telegraphs, a device used to shake loose the filings of a coherer.
6. A tapster. (US)
7. An assistant in the sport of paraswimming who taps blind or visually impaired swimmers with a pole to indicate when they should turn around.

复数 tappers