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

1.
congelar, cobrir-se de gelo
if a body of water freezes over, it becomes covered with ice
:
•
The pond froze over completely during the cold snap.
O lago congelou completamente durante a onda de frio.
•
We can go ice skating once the lake freezes over.
Podemos ir patinar no gelo assim que o lago congelar.