freeze over
US /friːz ˈoʊ.vər/
UK /friːz ˈoʊ.vər/

1.
结冰, 冻结
if a body of water freezes over, it becomes covered with ice
:
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The pond froze over completely during the cold snap.
寒潮期间,池塘完全结冰了。
•
We can go ice skating once the lake freezes over.
湖面结冰后,我们就可以去滑冰了。