A bitter pill to swallow is something that is hard to accept.
Black and white
When it is very clear who or what is right and wrong, then the situation is black and white.
Black hole
If there is a black hole in financial accounts, money has disappeared.
Black sheep
Someone who is the black sheep doesn't fit into a group or family because their behaviour or character is not good enough.
Blessing in disguise
If some bad luck or misfortune ultimately results in something positive, it's a blessing in disguise.
Blind as a bat
If you are in total darkness and can't see anything at all, you are as blind as a bat.
Blood is thicker than water
This idiom means that family relationships are stronger than others.
Blood out of a stone
If something is like getting blood out of a stone, it is very difficult indeed.
Blood, sweat and tears
If something will take blood, sweat and tears, it will be very difficult and will require a lot of effort
and sacrifice.
Blow a gasket
If you blow a gasket, you get very angry.
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