tapper
名词 tapper:
a tavern keeper who taps kegs or casks
同义词:tapster
a person who strikes a surface lightly and usually repeatedly
a worker who uses a tap to cut screw threads
someone who wiretaps a telephone or telegraph wire
同义词:wiretapper, phone tapper
a dancer who sounds out rhythms by using metal taps on the toes and heels of the shoes
同义词:tap dancer