steam up
US /stiːm ʌp/
UK /stiːm ʌp/

1.
appannarsi
to cover with condensed water vapor, making it difficult to see through
:
•
The bathroom mirror always steams up after a hot shower.
Lo specchio del bagno si appanna sempre dopo una doccia calda.
•
The car windows started to steam up in the cold weather.
I finestrini dell'auto hanno iniziato ad appannarsi con il freddo.
2.
arrabbiarsi, infuriarsi
to become angry or agitated
:
•
He started to steam up when he heard the bad news.
Ha iniziato a arrabbiarsi quando ha sentito la brutta notizia.
•
Don't let him steam up, just try to calm him down.
Non lasciarlo arrabbiarsi, cerca solo di calmarlo.