clack 
/ˈklæk/ verb
clacks; clacked; clack·ing /ˈklæk/ verb : to make or cause something to make a short sharp sound or series of short sharp sounds [no obj] ▪ I heard her heels clacking down the hall. ▪ An old fan clacked (away) somewhere in another room. [+ obj] ▪ He clacked his teeth together.
— clack noun, plural clacks [count] — usually singular ▪ the clack of typewriter keys ▪ the clack of her heels
