Synonym: betray, betrayer, blabber, blackleg, bum, crumb, denounce, dirty dog, fink, git, give away, grass, informer, lowlife, puke, rotter, scab, scum bag, shit, shop, skunk, snitch, so-and-so, squealer, stag, stinker, stinkpot, strikebreaker, tell on. Similar words: rate, ratio, rating, or rather, operate, scratch, gratify, operator. Meaning: [ræt] 
n. 1. any of various long-tailed rodents similar to but larger than a mouse 2. someone who works (or provides workers) during a strike 3. a person who is deemed to be despicable or contemptible 4. one who reveals confidential information in return for money 5. a pad (usually made of hair) worn as part of a woman's coiffure. v. 1. desert one's party or group of friends, for example, for one's personal advantage 2. employ scabs or strike breakers in 3. take the place of work of someone on strike 4. give (hair) the appearance of being fuller by using a rat 5. catch rats, especially with dogs 6. give away information about somebody.
n. 1. any of various long-tailed rodents similar to but larger than a mouse 2. someone who works (or provides workers) during a strike 3. a person who is deemed to be despicable or contemptible 4. one who reveals confidential information in return for money 5. a pad (usually made of hair) worn as part of a woman's coiffure. v. 1. desert one's party or group of friends, for example, for one's personal advantage 2. employ scabs or strike breakers in 3. take the place of work of someone on strike 4. give (hair) the appearance of being fuller by using a rat 5. catch rats, especially with dogs 6. give away information about somebody. 
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31. He had nothing to do all day long but to rat around.
32. A rat took the egg while the mother was away from the nest.
33. What did you do with the gun you took from that little rat Turner?
34. He leapt out of his seat when he saw the rat.
35. People think I'm sick for having a rat as a pet.
36. The novel is about a couple who get out of the rat race and buy a farm in France.
37. I smelt a rat when he started being so helpful!
38. The lab assistant injected the rat with the new drug.
39. It's very easy to get caught up in the rat race.
40. You dirty rat! How could you do a thing like that?
41. The police are all over town. He's caught, like a rat in a trap.
42. He's been working late with her every night this week - I smell a rat!
43. The arrival of warm weather raises the specter of disease and increased rat infestations caused by rotting garbage.
44. Dad wants to get out of the rat race and move back to his hometown.
45. I might have known he'd be the first rat to desert this sinking ship!
46. They longed to escape from the rat race and move to the countryside.
47. The road has become a rat run for traffic avoiding the town centre.
48. The arrival of warm weather raises the spectre of disease and increased rat infestations caused by rotting garbage.
49. He decided to get out of the rat race, and went to work on a farm.
50. They were accused of encouraging children to rat on their parents.
51. If I don't send a picture, he will smell a rat.
52. The dog was a useful rat catcher in the warehouse.
53. As far as I'm concerned, she's copped out and joined the rat race.
54. The road through our village has become a rat run for commuters trying to avoid delays on the A14.
55. Where I come from, you don't rat on your friends.
56. Rat remains his dapper,[sentencedict.com] timeless self.
57. I wouldn't rat on Albert.
58. Suffice to say, we smell a rat.
59. I have to rat all he has reet.
60. It smelled of damp mold and rat excrement.
More similar words: rate, ratio, rating, or rather, operate, scratch, gratify, operator, moderate, accurate, desperate, cooperate, tolerate, decorate, at any rate, operating, rather than, operation, generate, strategy, Democrat, migration, integrate, frustrate, narrative, elaborate, corporate, strategic, cooperative, incorporate.