Collocations for threaten - verb

publicly
personally, physically
He says he was physically threatened in an attempt to get him to sign over his rights.

repeatedly
She had repeatedly threatened to commit suicide.

allegedly, reportedly

with
She threatened him with a gun.

feel threatened
I never felt threatened by him.

gravely (esp. AmE), seriously, severely
Our way of life is gravely threatened.
social unrest which seriously threatens the stability of the whole area

increasingly
directly
constantly, continually
Our marriage was constantly threatened by his other women.

potentially

could
appear to, seem to

be threatened with sth
Many species are now threatened with extinction.

Threaten is used with these nouns as the subject:
danger, disaster, rain, union, violence, war, weather

Threaten is used with these nouns as the object:
annihilation, boycott, civilization, crackdown, economy, environment, existence, fabric, foundation, freedom, future, habitat, health, industrial action, institution, integrity, interest, liberty, life, litigation, livelihood, neighbour, peace, penalty, rain, rebellion, reprisal, resignation, retaliation, safety, sanction, sanity, security, sovereignty, stability, status quo, stoppage, strike, suicide, supply, survival, veto, viability, violence, well-being, wildlife, witness