at the drop of a hat

Definition

Without any hesitation; instantly.

Etymology

From the customary starting of competitions by making a sweeping downward motion with a cap.

Example Sentences

• "We're expected to just do it at the drop of a hat."
• "If you need help, just call on Mike. He can come at the drop of a hat."
• "A tremendous thing happened when Dean met Carlo Marx. Two keen minds that they are, they took to each other at the drop of a hat."