to jump the gun
Ele queimou a largada e contou a surpresa antes da hora.
He jumped the gun and revealed the surprise too early.
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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