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in a situation where there is risk or hazard; in danger. (*Typically: be ~; put someone or something ~.) I refuse to put my family's welfare at risk by quitting my job. Your whole future is at risk if you don't stop smoking.
1. In danger, as in Their house's location on the San Andreas Fault puts them at risk in the next major earthquake . [c. 1900]
2. Legally responsible to pay for loss or damage, as in If he can't keep up with the insurance premiums, he is at risk for any liability claims on the property . [Late 1700s]
In an endangered state, especially from lack of proper care: unsupervised children who are at risk of dropping out of school.