in a snap

cold snap

A short and sudden period of cold weather.

in the snap of one's fingers

In a snap.

snap at

To lash out with a verbal attack.

snap at someone's heels

To compete with someone closely, with the possibility of soon defeating or replacing them.

snap back

To recover quickly.

snap it up

To hurry, to proceed quickly.

snap judgment

A decision made without deliberation or in excessive haste.

snap out of

To terminate suddenly a mood, emotional state, or reverie.