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We acted in good faith – we did not know the goods were stolen.
She claims that she acted out of necessity (=because she had to).
Had the paramedics not acted so swiftly, he would have died.
We must act now to prevent further damage to our rainforests.
Lawyers acting for the family will issue a statement this morning.
Stop acting stupid!
I've acted like a total idiot.
A man was seen acting suspiciously twenty minutes before the robbery.
Just act as if nothing's happened.
I've always wanted to act.
Burt Lancaster acted the part of Joseph.
Don't expect the medicine to act immediately.
The experiment should show us how sugars act on the enamel of the teeth.
This is the American English definition of act. View British English definition of act.