If you are in your birthday suit, you are naked.
If you take or have the bit between your teeth, you take or have control of a situation. (Bit = piece of metal in a horse's mouth)
If someone has a small or unimportant role in something, they have a bit part.
A bit player has a small or unimportant role in something.
Bite off more than you can chew
If you bite off more than you can chew, you take on more responsibilities than you can manage. 'Don't bite off more than you can chew' is often used to advise people against agreeing to more than they can handle.
If you bite someone's head off, you criticise them angrily.
If you have to bite the bullet, you have to accept or face something unpleasant because it cannot be avoided.
This is a way of saying that somebody has died, especially if they are killed violently like a soldier in battle.
If you have to bite your lip, you have to make a conscious effort not to react or to keep quiet about something that displeases you.
If you bite your tongue, you refrain from speaking because it is socially or otherwise better not to.
Bits and bobs are small, remnant articles and things- the same as 'odds and ends'.
If you do something to the bitter end, you do it to the very end, no matter how unsuccessful you are.
A bitter pill to swallow is something that is hard to accept.
This means bruised, either physically or metaphorically.
When it is very clear who or what is right and wrong, then the situation is black and white.
(UK) If things are as black as Newgate's knocker, they are very bad. Newgate was an infamous prison in England, so its door knocker meant trouble.
If there is a black hole in financial accounts, money has disappeared.
Someone who is the black sheep doesn't fit into a group or family because their behaviour or character is not good enough.
If you vote against allowing someone to be a member of an organisation or group, you are blackballing him or her.
If you are given a blank cheque, you are allowed to use as much money as you need for a project.
A blank slate is something that hasn't been developed or described in any detail.
Similar to 'cutting edge', this implies a technology or process that is at the forefront or beyond current practices. However, because it is unproven, it is often dangerous to use (hence the 'bleeding').
A bleeding heart is a person who is excessively sympathetic towards other people.
This expression is used as to patronise someone, especially when they don't realise that they're not very clever.('Bless your pointes little head' is also used.)
If some bad luck or misfortune ultimately results in something positive, it's a blessing in disguise.
If people accept thing blindly, they accept them without questioning them at all.
If you are in total darkness and can't see anything at all, you are as blind as a bat.
When the blind are leading the blind, the people in charge of something don't know anything more than the people they are in charge of, when they should have greater knowledge.
If you are blind-sided, an event with a negative impact takes you completely by surprise.
If something happens in the blink of an eye, it happens so fast it is almost impossible to notice it.
An emotional speech or performance is full of blood and thunder.
It is impossible to get something from someone if they don't have it, just as you cannot get blood from a turnip.
This idiom means that family relationships are stronger than others.
(AU) If an Australian says to you "Your blood is worth bottling", he/she is complimenting or praising you for doing something or being someone very special.
If something is like getting blood out of a stone, it is very difficult indeed.
If something will take blood, sweat and tears, it will be very difficult and will require a lot of effort and sacrifice.
If you blot your copybook, you make a mistake or do something wrong that will negatively affect someone's opinion of you.
If you blow a fuse, you become uncontrollably angry.
If you blow a gasket, you get very angry.
A blow-by-blow description gives every detail in sequence.
If you blow hot and cold on an idea, your attitude and opinion keeps changing; one minute you are for it, the next you are against.
People say '(well,) blow me down' when you have just told them something surprising, shocking or unexpected. ('Blow me down with a feather' is also used.)
(USA) If you blow off steam, you express your anger or frustration.
If something, like an idea, is blown out of the water, it is destroyed or defeated comprehensively.
(USA) If people blow smoke, they exaggerate or say things that are not true, usually to make themselves look better.
If you blow the cobwebs away, you make sweeping changes to something to bring fresh views and ideas in.
If somebody blows the whistle on a plan, they report it to the authorities.
Something that will blow your mind is something extraordinary that will amaze you beyond explanation.
If you blow your own horn, you boast about your achievements and abilities. ('Blow your own trumpet' is an alternative form.)
If someone blows their own trumpet, they boast about their talents and achievements. ('Blow your own horn' is an alternative form.)
If you blow your stack, you lose your temper.
If someone blows their top, they lose their temper.
Someone with blue blood is royalty.
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