To break down the courage of, as by sudden danger or insuperable difficulty; overcome with fear of impending calamity or failure; fill with despairing apprehension; utterly dishearten: usually in the past participle.To defeat by sudden onslaught; put to rout.To disquiet; trouble: usually reflexive.Synonyms To appal, daunt, dispirit, deject, frighten, paralyse, demoralize.To be daunted; stand aghast with fear; be confounded with terror.n. Sudden or complete loss of courage; despairing fear or apprehension; discouraged or terrified amazement; utter disheartenment.n. Ruin; defeat; destruction.n. Synonyms Apprehension, Fright, etc. (see alarm); discouragement.