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a situation involving exposure to danger:

〖具体例では可算〗 «危害･損害などの/…という» 恐れ, 危険(性), リスク «of/that節» (!dangerより高い確率で, 自ら招いて起こる危機

e.g. flouting the law was too much of a risk

e.g. all outdoor activities carry an element of risk.

in singular the possibility that something unpleasant or unwelcome will happen:

e.g. reduce the risk of heart disease

e.g. as modifier : a high consumption of caffeine was suggested as a risk factor for loss of bone mass.

with modifier a person or thing regarded as a threat or likely source of danger:

«…にとっての» 危険因子, 有害なもの «to»

e.g. she's a security risk

e.g. gloss paint can burn strongly and pose a fire risk.

(usually risks) a possibility of harm or damage against which something is insured.

(保険の)危険度, 率, リスク

with adjective a person or thing regarded as likely to turn out well or badly, as specified, in a particular context or respect:

〖形容詞を伴って〗被保険者, 物

e.g. Western banks regarded Romania as a good risk.

the possibility of financial loss:

e.g. as modifier : project finance is essentially an exercise in risk management.

expose (someone or something valued) to danger, harm, or loss:

〈財産･命など〉を危険にさらす; «…に» 〈金など〉を賭ける «on» .

e.g. he risked his life to save his dog.

act or fail to act in such a way as to bring about the possibility of (an unpleasant or unwelcome event):

〈敗北･死など〉の危機に陥る; 〖～ doing〗 …する恐れがある

e.g. unless you're dealing with pure alcohol you're risking contamination from benzene.

incur the chance of unfortunate consequences by engaging in (an action):

(危険･結果などを覚悟の上で)…をあえてする, 試みる; 〖～ doing〗 あえて…する

e.g. he was far too intelligent to risk attempting to deceive her.

exposed to harm or danger: 23 million people in Africa are at risk from starvation.

used to indicate that if harm befalls a person or their possessions through their actions, it is their own responsibility: they undertook the adventure at their own risk.

although there is the possibility of something unpleasant resulting: at the risk of boring people to tears, I repeat the most important rule in painting.

put one's life in danger.

expose oneself to the possibility of something unpleasant occurring: she preferred not to run the risk of encountering his sister.

with the possibility of endangering oneself or something: he visited prisons at considerable risk to his health.

mid 17th century: from French risque (noun), risquer (verb), from Italian risco ‘danger’ and rischiare ‘run into danger’.