in danger, at risk, said of something where there is a strong possibility something bad will happen to it (for example, a species in danger of going extinct)

simple past tense and past participle of endanger

(transitive) To put (someone or something) in danger; to risk causing harm to. / (obsolete, transitive) To incur the hazard of; to risk; to run the risk of.

(biology) A species which is in danger of becoming extinct throughout all or a significant portion of its range. / A class or kind whose continued existence is threatened.

present participle of endanger

The act of putting someone or something in danger.

Third-person singular simple present indicative form of endanger

simple past tense and past participle of endarken

present participle of endarken

(transitive, rare, chiefly literary) To render dark or darker. / (transitive, chiefly literary) To becloud, obscure, to obfuscate; to confound.