It's not an idiom because you can figure it out by the context. It means they went bald.
Quit bugging you-an expression.
"He lost his shirt" IS an idiom.
Meaning you snapped and got angry.
Keep bothering someone.
you was close to something,you almost got it
Doing anything "by a hair" means that you barely manage it. If you win by a hair, you win only by the margin as wide as a hair is. If you lose by a hair, you almost won. You can also have a "close shave," which is an idiom meaning that you escaped something bad by a hair's width.
What happens when something gets in your hair? It's annoying, right? You have to stop and deal with it. Getting in your hair means interrupting you, getting in your way in an annoying fashion. A similar idiom is getting on your nerves.
The idiom, "You lost your marbles," means that you've gone crazy.
It means she got really upset or angry, and lost her temper.
it is when you are in a situation that is scary and frightening or dangerous, and the hair on your body stands on end.
It's another way of saying you're lost - as if you are out at sea where there are no landmarks to find your way. This can be physically lost or figuratively lost, as in you don't know something.
It means that the game is over and that you have lost and that you souldnt have tried to do the thing in the first place!