Synonym: chance, endanger, expose, gamble, hazard, imperil, jeopardize, venture. Antonym: safety. Similar words: brisk, risky, disk, rise, perish, Irish, arise, wrist. Meaning: [rɪsk] 
n. 1. a source of danger; a possibility of incurring loss or misfortune 2. a venture undertaken without regard to possible loss or injury 3. the probability of becoming infected given that exposure to an infectious agent has occurred 4. the probability of being exposed to an infectious agent. v. 1. expose to a chance of loss or damage 2. take a risk in the hope of a favorable outcome.
n. 1. a source of danger; a possibility of incurring loss or misfortune 2. a venture undertaken without regard to possible loss or injury 3. the probability of becoming infected given that exposure to an infectious agent has occurred 4. the probability of being exposed to an infectious agent. v. 1. expose to a chance of loss or damage 2. take a risk in the hope of a favorable outcome. 
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121. You put your tenancy at risk if you fall behind with the rent.
122. We had been forewarned of the risk of fire/that fire could break out.
123. The risk of developing heart disease increases with the number of cigarettes smoked.
124. The higher the interest rate, the greater the financial risk - which, of course, cuts both ways.
125. I'm not going to risk my neck playing rugby with you!
126. Healthy eating can help reduce the risk of heart disease.
127. I never walk home alone at night - it's not worth the risk .
128. Are you prepared to risk traveling without an armed guard?
129. There was a risk the brain might be starved of oxygen.
130. My doctor advised me that eating red meat increased the risk of cancer.
131. The treatment is usually given to women with a high risk of relapse after surgery.
132. She was prepared to risk everything on a last throw of the dice.
133. He had shown himself careless of personal safety where the life of his colleagues might be at risk.
134. The director took a calculated risk in giving the film's main role to an unknown actor.
135. Britain did not want to risk a breach with the US over sanctions.
136. Relative to atypical antipsychotic use, conventional antipsychotic use was associated with a higher risk for death at all time points.
137. A report recently published in the American Journal of Epidemiology suggested that smoking increased the risk of developing non-insulin-dependent diabetes mellitus by more than three times.
138. He puts his administration at risk if he doesn't come through on these promises for reform.
139. If you tell him the truth,(http://sentencedict.com/risk.html) you run the risk of hurting his feelings.
140. The fear of violent crime has now risen out of all proportion to the actual risk.
141. Owners are reminded that they leave their cars here at their own risk.
142. At the risk of sounding self-pitying, I'd say it has been harder on me than it has on Joanne.
143. I decided not to risk a second close encounter with the snakes.
144. There is an acknowledged risk of lung cancer from radon.
145. Everybody who goes into this region, whoever they are, is at risk of being taken hostage.
146. It could be argued that a dam might actually increase the risk of flooding.
147. Wearing the correct type of clothing will reduce the risk from radiation.
148. Heavy reliance on one client is not without risk when building up a business.
149. My father was too proud to risk a rebuff, so he simply did not ask her.
150. We were in the invidious position of having to choose whether to break the law or risk lives.