Question of time
When it's certain to happen, but we don't know exactly when.
Quick as a flash
When something happens very fast.
Quick buck
If you make some money easily, you make a quick buck.
Quick fix
A quick fix is an easy solution, especially one that will not last.
Quick off the mark
If someone is quick off the mark, they are very quick to use, start or do something new.
Quick on the trigger
Someone who is quick on the trigger acts or responds quickly.
Quids in
If somebody is quids in, they stand to make a lot of money from something.
Quiet as a cat
If somebody is as quiet as a cat they make as little noise as possible and try to be unnoticeable.
Quiet as a mouse
If someone's as quiet as a mouse, they make absolutely no noise.
Quiet before the Storm
When you know that something is about to go horribly wrong, but hasn't just yet, then you are in the quiet before the storm.
Quitters never win; winners never quit
If you quit you will never get what you want, but if you keep trying you will find a way to get what you want.