cantar el gallo

1.
Pan-Hispanicneutralliterary
- To occur at dawn; when the rooster crows; at daybreak.
- A temporal marker meaning 'at the first light of morning' or 'when morning comes'.
2.
Pan-Hispaniccolloquialidiomatic
- The decisive or revealing moment; the moment of truth or reckoning when something inevitable happens.

Examples:

ES: Se desvaneció al cantar el gallo.
EN: It faded on the crowing of the cock.
ES: Es al cantar el gallo.
EN: He means at cockcrow.
ES: Pero antes, deberá cantar el gallo tres veces.
EN: But he can't wake up, until a cock crows three times.
ES: Se ha desvanecido al cantar el gallo.
EN: It faded on the crowing of the cock.
ES: Yo oigo siempre cantar el gallo a las nueve, y es raro que una joven huya.
EN: I always hear them crow at 9 o'clock and no girl ever eloped.
ES: (Solo ganas si eres el único humano al cantar el gallo al amanecer)
EN: (You win only if you are the only human when a rooster crows at dawn.)
ES: Si una persona sobrevive y se para en la plataforma exclusiva de humanos al cantar el gallo al amanecer, esa persona gana.
EN: If one person survives and stands on the platform... that only humans can when a rooster crows at dawn, that person wins.
ES: Ya va a cantar el gallo.
EN: It's almost morning. Yeah.