Definition from macmillandictionary.com
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Many old buildings have cracks in their walls.
Hairline cracks appear in the paint when it dries too quickly.
She peered out through the crack in the curtains.
events which deepened the cracks in the monarchy
After only a year cracks started to appear in their marriage.
the sharp crack of a single gunshot
He’s had a nasty crack on the head.
We thought we’d have a crack at running our own business.
Some of the students were making cracks about her appearance.
Come in and give us some of your crack.