Synonym: admonish, advise, alert, browbeat, bulldoze, bully, caution, forebode, harass, intimidate, menace, terrorize, warn. Similar words: threat, thread, create, three, threshold, with regard to, with respect to, great. Meaning: ['θretn] 
v. 1. pose a threat to; present a danger to 2. to utter intentions of injury or punishment against:"He threatened me when I tried to call the police" 3. to be a menacing indication of something:"The clouds threaten rain".
v. 1. pose a threat to; present a danger to 2. to utter intentions of injury or punishment against:"He threatened me when I tried to call the police" 3. to be a menacing indication of something:"The clouds threaten rain". 
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181. Fertility rates in many European nations and Japan have dropped below the replacement rate, causing concern that shortages of labor and productivity could threaten the quality of life.
More similar words: threat, thread, create, three, threshold, with regard to, with respect to, great, treaty, retreat, entreat, greatly, creating, creature, treatment, breathing, theater, out of breath, sweater, patent, break through, repeatedly, eat, neat, feather, eat up, wheat, leather, come at, cheat.