threaten : Idioms & Phrases
life-threatening
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adjective satellite causing fear or anxiety by threatening great harm
grievous; dangerous; severe; serious; grave.
- a dangerous operation
- a grave situation
- a grave illness
- grievous bodily harm
- a serious wound
- a serious turn of events
- a severe case of pneumonia
- a life-threatening disease
WordNet
threatened abortion
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noun the appearance of symptoms that signal the impending loss of the products of conception
imminent abortion.