I. noun
1.
a signal that warns or calls to action
the alarm consisted of two quick flashes of light
Synonyms: alert, SOS, tocsin
Related Word: caution, forewarning, prenotice, warning
2.
Synonyms: fear 1, cold feet, consternation, dismay, dread, fright, horror, panic, terror, trepidation
Related Word: upset; strain, stress, tension
Contrasted words: calm, calmness, serenity, tranquillity; equanimity, sangfroid
Antonyms: assurance; composure
II. verb
Synonyms: frighten , affright, awe, fright, scare, ||spook, startle, terrify, terrorize
Related Word: amaze, astonish, surprise
Idioms: give one a turn
Contrasted words: comfort, console, solace
Antonyms: assure, relieve