quick on one's feet

bright spark

A person who is intelligent, clever or quick-witted.

quick on the uptake

Able to readily understand things; aware and intelligent.

quick study

One who is capable of learning at a fast pace; a fast learner.

quick as a flash

Extremely quickly.

quick off the mark

fast to act or react

quick on the draw

Characterized by rapid response, as to a verbal remark or to a new sit…