This Q idioms list is very short because there aren't many words beginning with the letter Q. As you can see, each idiom on this list has a main word that begins with the letter "Q." If you're interested, I've also covered the other letters of the alphabet: click here to go to the main idioms page.
First things first: remember that an idiom is a group of words whose meaning is different from the individual words if you looked them up separately in the dictionary.
Now, let's take a look at the most popular Q idioms. There is "no question" you can learn this list quickly since there aren't too many.
QUANDARY
(in) a quandary: in a situation where you are confused and don’t know what to do. Example: He’s in a quandary about whether to spend $100,000 on business school or just try to start his own business and learn from experience. Read more examples
QUARTERS
in close quarters: being together with others in a small space. Example: After having my own room and bathroom my whole life it’s been challenging to live in close quarters with roommates at the dorm. Read more examples...
QUESTION(S)
beyond question: there is no doubt about something. Example: My parents’ good intention is beyond question but they’re wrong to make me come home early just because I’m a girl. Read more examples...
call into question (call something into question): to make something uncertain or doubtful; to question something. Example: These recent test scores call into question whether you can handle working part-time and still get good grades... read more examples
in question: 1) under consideration; 2) in dispute. Read more examples...
no question: definitely, without any doubt. Example: There's no question that my boss is pregnant—she is throwing up in the bathroom every morning and is very sensitive to smells. Read more examples...
out of the question: impossible; not to be considered. Example: My parents said a trip to Europe is out of the question until I’m 18 years old. Read more examples...
pop the question: to propose marriage (ask someone to marry). Example: I need to think of a really romantic way to pop the question to my girlfriend. Read more examples...
without question: definitely, without any doubt. Example: Without question this is the best chocolate cake I’ve ever tasted — could you share the recipe? Read more examples...
no questions asked: not needing to provide additional information. Example: This store has the best return policy! They let me return the shoes with no questions asked, even after I wore them. Read more examples...
QUICK
quick on the uptake: to be able to understand something very quickly. Example: I already explained that to her twice. This new secretary is not quick on the uptake. Read more examples...
QUIET
quiet as a mouse: very quiet and / or shy. Example: My twins couldn’t be more different: one is a gregarious cheerleader and the other is quiet as a mouse. Read more examples...
QUITE
quite a bit: a lot of; much. Example: She wanted to marry a man with quite a bit of money so she found someone who was 20 years older. Read more examples...
quite a few: many. Example: You have quite a few boyfriends, don’t you? Read more examples...
quite a lot: many, much. Example: I’m sorry I can’t go out tonight I’ve got quite a lot of homework to do. Read more examples...
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You can also find many idiom definitions with one of the online learner's dictionaries.