Meaning
To jump the gun
Example
Ele queimou a largada e contou a surpresa antes da hora.
He jumped the gun and revealed the surprise too early.
Origin
The expression comes from the world of racing. At the start of athletics events the gun signals the off, and a runner who bolts before the shot — or, in motor racing, lurches off before the lights — commits a queima de largada, a false start.
Source: Tecla SAP.
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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