AMERICAN IDIOMS STARTING WITH Q
Quick study:
Someone who is able to memorize or learn something quickly and easily."I was worried she wouldn't be able to get up to speed quickly enough, but she proved to be a quick study."
Quite a few:
Many. ex. "There were quite a few people at the concert yesterday."
Quite a bit:
A lot.
(As) quiet as a mouse:
Very quiet.
Quick on the uptake:
Quick to understand.
Quick and dirty:
Fast and simple, not very sophisticated.