English Dictionary
Define dictionary terms easily — search for "example", "dictionary", "language", or "word" in our powerful online English dictionary.
Define dictionary terms easily in our powerful online English dictionary.
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if children act up, they behave badly
The kids have been acting up again.
if a part of your body or a piece of equipment acts up, it starts to become painful or to develop problems
I hope my back doesn't start acting up again.
