almost immediately.

Everyone was packed and ready to leave at a moment's notice.

Related vocabulary: at the drop of a hat, on the spur of the moment

• knight in shining armor
• knight in shining armour
• knit brows
• knit your brows
• knives are out
• knock block off
• knock dead
• knock down
• knock-down-drag-out
• knock 'em dead
• knock for a loop
• knock for six
• knocking shop
• knock into shape
• knock it off
• Knock it off!
• knock off
• knock off feet
• knock off pedestal
• knock off perch
• knock off something
• knock off their feet
• knock off their pedestal
• knock off their perch
• knock on the head