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5 VERB [usu passive] If something or someone is clocked at a particular time or speed, their time or speed is measured at that level. □ [be V -ed + at ] He has been clocked at 11 seconds for 100 metres.

6 → see also alarm clock , biological clock , body clock , cuckoo clock , grandfather clock , o'clock

7 PHRASE If you are doing something against the clock , you are doing it in a great hurry, because there is very little time. □  The emergency services were working against the clock as the tide began to rise. □  It's now become a race against the clock.

8 PHRASE If something is done round the clock or around the clock , it is done all day and all night without stopping. □  Rescue services have been working round the clock to free stranded motorists.

9 PHRASE If you want to turn the clock back or put the clock back , you want to return to a situation that used to exist, usually because the present situation is unpleasant. □  In some ways we wish we could turn the clock back. □  We cannot put back the clock.

▸  clock in PHRASAL VERB When you clock in at work, you arrive there or put a special card into a device to show what time you arrived. □ [V P ] I have to clock in by eight.

▸  clock off PHRASAL VERB When you clock off at work, you leave work or put a special card into a device to show what time you left. □ [V P ] The Night Duty Officer was ready to clock off. □ [V P n] They clocked off duty and left at ten to three.

▸  clock on PHRASAL VERB When workers clock on at a factory or office, they put a special card into a device to show what time they arrived. □ [V P ] They arrived to clock on and found the factory gates locked.

▸  clock out PHRASAL VERB Clock out means the same as clock off . □ [V P + of ] She had clocked out of her bank at 5.02pm using her plastic card. [Also V P ]

▸  clock up PHRASAL VERB If you clock up a large number or total of things, you reach that number or total. □ [V P n] In two years, he clocked up over 100 victories.

clo ck tow|er (clock towers ) N‑COUNT A clock tower is a tall, narrow building with a clock at the top.

clock|wise /klɒ kwa I z/ ADV [ADV after v] When something is moving clockwise , it is moving in a circle in the same direction as the hands on a clock. □  He told the children to start moving clockwise around the room. ● ADJ [ADJ n] Clockwise is also an adjective. □  Gently swing your right arm in a clockwise direction.

clock|work /klɒ kwɜː ^r k/

1 ADJ [ADJ n] A clockwork toy or device has machinery inside it which makes it move or operate when it is wound up with a key. □  …a clockwork train-set.

2 PHRASE If you say that something happens like clockwork , you mean that it happens without any problems or delays, or happens regularly. □  The Queen's holiday is arranged to go like clockwork, everything pre-planned to the minute.

clod /klɒ d/ (clods ) N‑COUNT A clod of earth is a large lump of earth.

clog /klɒ g/ (clogs , clogging , clogged )

1 VERB When something clogs a hole or place, it blocks it so that nothing can pass through. □ [V n] Dirt clogs the pores, causing spots. □ [V n] The traffic clogged the Thames bridges.

2 N‑COUNT [usu pl] Clogs are heavy leather or wooden shoes with thick wooden soles.

▸  clog up PHRASAL VERB When something clogs up a place, or when it clogs up , it becomes blocked so that little or nothing can pass through. □ [V P n] 22,000 tourists were clogging up the pavements. □ [V P ] The result is that the lungs clog up with a thick mucus.

clois|ter /klɔ I stə ^r / (cloisters ) N‑COUNT A cloister is a covered area round a square in a monastery or a cathedral.