clock1
  
  n.
   - an instrument that measures and indicates the time by means of a dial or a digital display. 
▸informal a measuring device resembling a clock, such as a speedometer.
 - 
(also dandelion clock)
 Brit. the downy spherical seed head of a dandelion. 
[from the child's game of blowing away the seeds to find out what time it is.]
 - Brit. informal a person's face.
 
v.
     - attain or register (a specified time, distance, or speed). 
▸achieve (a victory):
 he clocked up his first win of the year.
 - 
(clock in/out or Brit. on/off)
 register one's arrival at or departure from work by means of an automatic recording clock.
 - Brit. informal notice or watch.
 - informal, chiefly Brit. hit on the head.
 - Brit. informal illegally wind back the milometer of (a car).
 
 
  Phrase
  
    - round 
(or around)
 the clock
 all day and all night.  - turn 
(or put)
 back the clock
 return to the past or to a previous way of doing things. 
   
  Derivative
  
  Etymology
  ME: from Mid. Low Ger. and MDu. klocke, based on med. L. clocca ‘bell’.
 
  
    
clock2
  
  n.
 an ornamental pattern woven or embroidered on the side of a stocking or sock near the ankle.
 
  Etymology
  C16: of unknown origin.