Meaning
Stingy / cheapskate / tightwad
Example
Ele é tão mão de vaca que nunca paga nada.
He's so cheap he never pays for anything.
Origin
Literally "cow's hand". The image is of a closed cow hoof — clenched, unable to open and share.
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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