source: 驚かされる女の子｜無料GIF画像検索 GIFMAGAZINE 3108430

verb with object

cause (a person or animal) to feel sudden shock or alarm:

〈人･物･事が〉(不意に)〈人･動物〉をびっくりさせる, 驚かせる, はっとさせる (!be ～edなど分詞形容詞用法については→ startled)

e.g. a sudden sound in the doorway startled her

e.g. with infinitive : he was startled to see a column of smoke.

startler noun

Old English steartlian‘kick, struggle’, from the base of start. The early sense gave rise to ‘move quickly, caper’ (typically said of cattle), whence ‘cause to react with fear’ (late 16th century).