(~s, ~ing, ~ed)
If things ~ or if you ~ them, they make a short loud noise, especially when they hit each other.
The windshield wipers ~ed back and forth...
I ~ed one ski against the other and almost tripped.
VERB: V, V n
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Clack is also a noun.
...listening to the ~ of her shoes on the stairs...
Her bracelets were going ~-~-~, she was shaking so hard.
N-SING; SOUND