1 endanger, imperil, jeopardize, put at risk, put in jeopardy, put on the line
2 be imminent, be in the air, be in the offing, forebode, foreshadow, hang over, hang over (someone's) head, impend, loom over, portend, presage, warn
3 browbeat, bully, cow, intimidate, lean on (slang) make threats to, menace, pressurize, terrorize, warn
1 & 3 defend, guard, protect, safeguard, shelter, shield
English Collins Dictionary - English synonyms & Thesaurus
threaten ( threatens 3rd person present) ( threatening present participle) ( threatened past tense & past participle )
1 verb If a person threatensto do something unpleasant to you, or if they threaten you, they say or imply that they will do something unpleasant to you, especially if you do not do what they want.
He said army officers had threatened to destroy the town... V to-inf
He tied her up and threatened her with a six-inch knife... V n with n
If you threaten me or use any force, I shall inform the police. V n, Also V that
2 verb If something or someone threatens a person or thing, they are likely to harm that person or thing.
The newcomers directly threaten the livelihood of the established workers... V n
30 percent of reptiles, birds, and fish are currently threatened with extinction. be V-ed with n
3 verb If something unpleasant threatensto happen, it seems likely to happen.
The fighting is threatening to turn into full-scale war... V to-inf
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