clapper
noun [ C ] uk/ˈklæp.ər/ us/ˈklæp.ɚ/
铃舌;钟锤
a piece of metal that hangs inside a bell and makes the bell ring when it hits the sides
Idiom
like the clappersidiom UK old-fashioned informal 飞快地
extremely fast
You'll have to run like the clappers if you want to catch your train. 要是你想赶上火车就得飞奔。