To live, operate, or function with the unyielding belief in something, especially that which is fanciful, unrealistic, or untrue. Primarily heard in US. Watch the video
Category: Idiom of the Day
(someone) (just) doesn't know when to quit
Someone would be better off not doing something or acting a certain way because it is or may become destructive, counterproductive, futile, or undesirable. Watch the video
know (one's) own mind
To be firmly resolute and confident in one’s ideas, intentions, plans, or opinions. Watch the video
know-nothing
A completely ignorant, uninformed, or unknowledgeable person. Watch the video
know full well
To know or be aware of something without any possible doubt. Watch the video
not know (someone) from a bar of soap
To be completely unaware of or know nothing about someone; to have never met the person indicated. Watch the video
know every trick in the book
To be aware of or knowledgeable in every possible way to do or achieve something, especially ways that are clever, cunning, or ethically questionable. Watch the video
knock (one's) head against a/the wall
To attempt continuously and fruitlessly to accomplish some task or achieve some goal that is or seems ultimately hopeless. Watch the video
be knocking on heaven's door
To be dying; to be approaching or very close to death (i.e., about to be admitted into the afterlife). Watch the video
knock (someone) over with a feather
To shock, confuse, or astonish someone to a point of complete bewilderment; throw someone for a loop. More often phrased as “you could have knocked me over with a feather,” expressing great bewilderment or surprise. Watch the video