quick off the mark
quicker than you can say Jack Robinson
quid pro quo
rápido de reflejos
en un abrir y cerrar de ojos
compensación
Our neighbour saw a man enter our house and was quick off the markcalling the police.
Sue got up and, quicker than you can say Jack Robinson, went out the door.
The school's re-accepting Jimmy is a quid pro quo for his parents' donation to the library.