Definition of freeze-up
1 : a freezing over of a body of water especially when marking the onset of winter goes on duty in April, just before the swans arrive, and stays with them until they leave at freeze-up— Lyn Harrington
2 : a period during which the bodies of water in an area are frozen over the freeze-up lasted six weeks last year before the freeze-up sets in— V. E. Fuchs all their food for seven months had to be taken to camp before the winter freeze-up— Bill Wolf
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