It means that something happened that was completely unexpected or unforeseen, like an item falling out of a blue sky. This phrase comes from an older one, "like a bolt out of the blue," that is, a lightning bolt that materializes from a cloudless sky to suddenly strike the earth. In other words, whatever took place "out of the blue" seems to have had a mysterious, unknown origin.
Feeling blue means you are sad or possibly depressed.
Feeling blue means you are sad or possibly depressed.
"Blue blood" LITERALLY means blood that is blue in color.
it means go to sleep
It means someone has blue eyes.
It means to start a journey or to leave.
It means swearing violently and creatively.
if someone is true-blue, they support something or someone completely n…
It means talk a lot - a whole lot!
This is an idiom meaning to narrow your focus down. It can also mean to narrow your aim and focus on one thing to hit. Picture the zero as a target and you get the idea of the idiom.
It means to be patriotic (by reference to flying the flag).
It either means to hit someone on their nose, or if it's an idiom, it means to hit something dead on, or to get something exactly right.