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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121. As he looked, the great rat dropped from the rope on to the old oak chair.
122. I had another bout on Monday, with Eugene Phillips, who at eight was tougher than a latrine rat.
123. The rat poison and insecticide was taken from a van at Farm lane in Crawley near Witney.
124. He would go down into the cellar tomorrow and put down some rat poison.
125. We started to smell a rat when they asked for an extra ￡500 deposit.
126. And thus begins a chase, with the Rat almost always being one step ahead.
127. But Rat, I am going to show you the World.
128. Edinburgh Sheriff Court had heard that the boys bought the rat poison from Boots, and offered to cook dinner.
129. Iggy Pop has a cameo as a bordello patron named Rat Face.
130. He has equipped him, too, with a moral certainty which the Rat recognises and envies.
131. The child was rushed to the hospital after eating rat poison.
132. Clare wouldn't put it past Sam to use a rat to lay a trap for her.
133. This is a good way to get back at that rat Yossarian.
134. He turned angrily to remonstrate with Tommy, only to see a rat the size of a rabbit lying between his legs.
135. The rat experiments that we have been considering suggest that the interference theory is more accurate.
136. The black rat was far more of a town-dwelling species and dependent on human food.
137. In the rat, very high single doses of intravenous mesalazine cause acute tubular and papillary necrosis.
138. The rat with no exercise wound up as a bond salesman.
139. Various actors and entertainers drifted in and out of the Rat Pack.
140. He could smell a rat, and he knew just how the men had been cheated.
141. Only a short piece was still attached to the bell, and the rat was still hanging on to it.
142. Not a doghouse, not a rat trap, not a rabbit hutch... not anything, not yet.
143. She felt that he was beginning to smell a rat.
144. She decided to drop out of the rat race because she couldn't stand working 60 hours a week.
145. Invitro certain combinations of oncogenes cooperate to transform primary rat cells.
146. Derrick Evans is Roland Rat with pecs appeal - and the housewives love it.
146. Wish you can benefit from our online sentence dictionary and make progress day by day!
147. Wet as a water rat, she sat hugging her knees.
148. They jogged round a corner, and found themselves in what passed for the town square of Dead Rat, Arizona.
149. Indeed, perhaps inimical to ours, in view of the hostility of such long standing between man and rat.
150. Montgomery etal isolated cells from 18 day fetal rat intestine by trypsin dissociation.
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.