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. 
Random good picture Not show
61. There were little lamps illuminating the little rat alleys.
62. I smell a rat here - I really do.
63. It is completely absent in the rat.
64. Each cage held at least one white rat.
65. Blackrag Madonna is blind as a dead rat.
66. Life is a rat race. 35.
67. Too much of a rat race.
68. The rat weights did not differ between the groups.
69. I got bitten by a rat.
70. It is enough to make you smell a rat and be damned for your cynicism.
71. Astra refuses to conduct further rat studies with lower doses of ranitidine, saying that this is Glaxo's job.
72. It is, therefore, quite helpless against a rat determined to attack.
73. At the camp, the doctor gave me a choice: rat poison or the stick.
74. It is hard to argue that the average rat has been endowed with conspicuous display ornaments by the preferences of ancestral females.
75. I only began to smell a rat when he couldn't come up with the documents he claimed to have.
76. Fleas desert a dead rat faster than rats desert a sinking ship, and that makes sense.
77. She gave him rat poison and then she took him out back and she had Howard bury him in her garden.
78. Magic shop in Plantation, the rat stock sells out nearly before it hits the shelves.
79. I would have slept on the floor but for fear of waking up face to face with a rat.
80. To his head they fixed a cage in which a rat had been imprisoned.
81. I slept fitfully, dreaming that a rat was softly nuzzling my ear.
82. In the rat small intestine, many drugs are acetylated and excreted into the lumen.
83. Learning becomes even more important in the feeding of so omnivorous an animal as the rat.
84. About 30 years ago the estrogen receptor protein was first isolated from the rat uterus.
85. Like Jitters, she had knocked around the world a bit and wound up in Dead Rat.
86. Others chat about the supposed late-night spotting of a large rat dragging a six-pack of bottled water across the warehouse floor.
87. A woman was poisoned with a soft drink laced with rat poison.
88. An executive from an international chemical company has given up the rat race to run a plant nursery.
89. In the rat cerebral cortex in the absence of calmodulin[sentencedict.com/rat.html], calcium has a negligible effect at low concentrations.
90. The predicted human protein contains only one amino acid change at position 101, from Asn in rat to Ser in human.
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.