startle UK /ˈstɑːt(ə)l/US /ˈstɑɹt(ə)l/verb 3noun 1forms 3phrases 1 verb3 •To move suddenly, or be excited, on feeling alarm; to start.Why shrinks the soul / Back on herself, and startles at destruction? — 1712 •To excite by sudden alarm, surprise, or apprehension; to frighten suddenly and not seriously; to alarm; to surprise.The supposition, at least, that angels do sometimes assume bodies need not startle us. — 1689 •(no longer used) To deter; to cause to deviate.it would blast all their hopes, and startle all other princes from joining — 1660 noun1 •A sudden motion or shock caused by an unexpected alarm, surprise, or apprehension of danger. formsstartled · startling · startles Phrases with startle startle upTo flush a target, usually birds and often accidentally.