Q

Queen of Hearts
A woman who is pre-eminent in her area is a Queen of Hearts.
Queer fish
A strange person is a queer fish.
Queer Street
If someone is in a lot of trouble, especially financial, they are in Queer Street.
Queer your pitch
If someone queers your pitch, they interfere in your affairs and spoil things.
Queue jumping
Someone who goes to the front of a queue instead of waiting is jumping the queue.
Quick as a flash
If something happens quick as a flash, it happens very fast indeed.
Quick buck
If you make some money easily, you make a quick buck.
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 mouse
If someone’s as quiet as a mouse, they make absolutely no noise.