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CPR /siː piː ɑː ^r / N‑UNCOUNT CPR is a medical technique for reviving someone whose heart has stopped beating by pressing on their chest and breathing into their mouth. CPR is an abbreviation for cardiopulmonary resuscitation . [MEDICAL ] □  McMullen performed CPR while other bystanders called 911.

CPU /siː piː juː / (CPUs ) N‑COUNT In a computer, the CPU is the part that processes all the data and makes the computer work. CPU is an abbreviation for 'central processing unit'. [COMPUTING ]

crab /kræ b/ (crabs ) N‑COUNT A crab is a sea creature with a flat round body covered by a shell, and five pairs of legs with large claws on the front pair. Crabs usually move sideways. ● N‑UNCOUNT Crab is the flesh of this creature eaten as food.

cra b ap|ple (crab apples ) N‑COUNT A crab apple is a tree like an apple tree that produces small sour fruit.

crab|by /kræ bi/ (crabbier , crabbiest ) ADJ Someone who is crabby is bad-tempered and unpleasant to people. [INFORMAL ]

crab|meat /kræ bmiːt/ also crab meat N‑UNCOUNT Crabmeat is the part of a crab that you eat.

crack

➊ VERB USES

➋ NOUN AND ADJECTIVE USES

➊ crack ◆◇◇ /kræ k/ (cracks , cracking , cracked )

1 VERB If something hard cracks , or if you crack it, it becomes slightly damaged, with lines appearing on its surface. □ [V ] A gas main had cracked under my neighbour's garage and gas had seeped into our homes. □ [V n] Crack the salt crust on the fish and you will find the skin just peels off.

2 VERB If something cracks , or if you crack it, it makes a sharp sound like the sound of a piece of wood breaking. □ [V ] Thunder cracked in the sky. □ [V n] He cracked his fingers nervously.

3 VERB If you crack a hard part of your body, such as your knee or your head, you hurt it by accidentally hitting it hard against something. □ [V n] He cracked his head on the pavement and was knocked cold.

4 VERB When you crack something that has a shell, such as an egg or a nut, you break the shell in order to reach the inside part. □ [V n] Crack the eggs into a bowl.

5 VERB If you crack a problem or a code, you solve it, especially after a lot of thought. □ [V n] He has finally cracked the system after years of painstaking research.

6 VERB If someone cracks , they lose control of their emotions or actions because they are under a lot of pressure. [INFORMAL ] □ [V ] She's calm and strong, and she is just not going to crack.

7 VERB If your voice cracks when you are speaking or singing, it changes in pitch because you are feeling a strong emotion. □ [V ] Her voice cracked and she began to cry.

8 VERB If you crack a joke, you tell it. □ [V n] Somebody cracked a joke and we all laughed.

9 → see also cracked , cracking

10 PHRASE If you say that something is not all it's cracked up to be , you mean that it is not as good as other people have said it is. [INFORMAL ] □  Package holidays are not always all they're cracked up to be.

▸  crack down

1 PHRASAL VERB If people in authority crack down on a group of people, they become stricter in making the group obey rules or laws. □ [V P + on ] The government has cracked down hard on those campaigning for greater democracy. □ [V P ] There has been a lot of drinking. We are cracking down now. Anyone who gets caught is fired.

2 → see also crackdown

▸  crack on PHRASAL VERB If you crack on with something, you continue doing it, especially with more effort than before, or as quickly as possible. [INFORMAL ] □ [V P ] You've just got to crack on, whatever the problems are. □ [V P + with ] Just tell him what to do and he'll crack on with the work.

▸  crack up