watch

watch
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重点：
1)watch what you say/your tongue
2)watch the world go by
3)Be on the watch for anything suspicious.

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watch [v.]

1. LOOK[I,T]

2. BE CAREFUL [T] to act carefully in order to avoid an accident or unwanted situation:
   [watch(that)]
     Watch he doesn't run into the road.
     She's a student and has to watch her budget closely.
   
   [watch what you say/your tongue/your language/your mouth etc](= be careful not to hurt or offend people
    by what you say)
     Employees should watch what they say in personal emails.
   [watch your weight/watch what you eat](= be careful not to get fat)
      He maybe a former athlete, but he still has to watch his weight.     

3. PAY ATTENTION [T] to pay attention to a situation that interests or worries you to see how it develops:
   [watch closely/carefully]
      American companies are watching Japanese developments closely.
      The government will watch the progress of these schemes with interest.
    
4. CARE FOR [T] to stay with someone or something so that nothing bad happens to them:
    She watches the kids for us occasionally.
5. SECURITY [T] to secrectly watch a person or place:
    I feel like I'm being watched.

13 [watch the world go by]
   to relax outside by just looking at the people around you:
      lingering in a pavement cafe, watching the world go by
14 [you watch] informal
   used to tell someone that you know what will happen:
   He'll win this time, you watch.

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watch [n.]
1. [c] a small clock that you wear on your wrist or keep in your pocket:
    My watch has stopped.
    How do you keep track of time if you don't wear a watch.
2.[singular, U]when you watch someone or something carefully, or pay careful attention to them,
   so that you are ready to act if necessary:
     The police arrived to keep watch on the mouth of the tunnel.
   [+on/over]
     He and his wife maintained a 24-hour watch ove their son.
     Security forces kept a close watch on our activities.
3. [keep a watch out for sb/sth] also [be on the watch for sb/sth]
   to be looking and waiting for something that might happen or someone you might see,especially so that
   you can avoid danger, trouble etc:
    Be on the watch for anything suspicious.
5. [C,U] a period of time when it is someone's duty to stay somewhere and look for signs of danger:
     The first watch is from now until midnight.
   [on watch]
     Who's on watch tonight?     
 
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Be on the watch for a sudden change in the patient's condition.
要密切注意病人病情可能突然变化。