startle - definition and synonyms

verb [transitive] 

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/ˈstɑː(r)t(ə)l/
present tense
I/you/we/theystartle
he/she/itstartles
present participlestartling
past tensestartled
past participlestartled
  1. to make a person or animal feel suddenly frightened or surprised by doing something that they do not expect

    Sorry, I didn’t mean to startle you.