alarm

Từ điển American Heritage Dictionary 4th

a·larm (ə-lärmʹ)n.
1. A sudden fear caused by the realization of danger.
2. A warning of existing or approaching danger.
3. An electrical, electronic, or mechanical device that serves to warn of danger by means of a sound or signal.
4. The sounding mechanism of an alarm clock.
5. A call to arms.tr.v. a·larmed, a·larm·ing, a·larms
1. To fill with alarm; frighten. See Synonyms at fear. See Synonyms at frighten.
2. To give warning to. [Middle English, from Old French alarme, from Old Italian allarme, from all'arme, to arms : alla, to the (from Latin ad illa: ad, to; see ad- + illa, neuter pl. of ille, that, the; See al-¹ in Indo-European Roots) + arme, arms (from Latin arma. See ar- in Indo-European Roots).] a·larmʹing·ly adv.

• Từ đồng nghĩa / Synonyms:
  alarm clock, alert, warning signal, alarum, warning device, alarm system, dismay, consternation, appal, appall, horrify