Meaning
To give the cold shoulder
Example
Se for me dar gelo, não esqueça a vodka!
If you're going to give me the cold shoulder, don't forget the vodka!
Origin
'Gelo' means ice. Giving someone ice = freezing them out with silence. The metaphor exists in several modern languages (English 'cold shoulder,' French 'battre froid').
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More idioms
Acertar na moscaTo guess correctly / To hit the nail on the headAmigo da onçaA fake/false friendAndar na linhaTo toe the line / To behave properlyArmar um barracoTo cause a public sceneRodar a baianaTo cause a public scene / To go ballisticArrumar sarna pra se coçarTo ask for troubleArrastar as asasTo hit on someone / To flirtAbrir o jogoTo come clean / To open upArregaçar as mangasTo roll up one's sleeves / To get to workAgarrar com unhas e dentesTo hold on for dear life / To seize an opportunity