(~s, ~ing, ~ed)
When someone ~s, their eyebrows become drawn together, because they are annoyed, worried, or puzzled, or because they are concentrating.
Nancy shook her head, ~ing...
He ~ed at her anxiously.
...a ~ing man.
VERB: V, V at n, V-ing
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Frown is also a noun.
There was a deep ~ on the boy’s face.
N-COUNT