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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Merriam-Webster unabridged
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