B2[T or I]to break something so that it does not separate, but very thin lines appear on its surface, or to become broken in this way: A stone hit the window and cracked the glass.I cracked my tooth as I fell.The walls cracked and the roof collapsed in the earthquake.Tearing and breaking into pieces›[I]informalto become mentally and physically weak: Stress and overwork are causing teachers to crack (up).Becoming and making less strong›[I]informalto fail as a result of problems: Their relationship began to crack (up) after their child died.Failing and doing badly›[I]If someone cracks, they begin to feel weak and agree that they have been defeated: He cracked during questioning and told us where to find the stolen goods.Accepting and agreeing reluctantlyAccepting and agreeingApproving and approval
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