To move suddenly, or be excited, on feeling alarm; to start. (verb)
A sudden motion or shock caused by an unexpected alarm, surprise, or apprehension of danger. (noun)
Examples of word startle
Kim Kardashian: we am in startle that [Brittany] Murphy has died!
The simple reaction that "he must be wrong" because his findings surprise or even startle is simple establishment bias.
September 30th, 2009 Oregon dad gets trial in startle neck cuff caseSALEM, Ore.
Occasionally he flung his arms up in what is known as the startle reflex, as if the shock of being in open air was too much for him and he feared falling through space.
In this study, U.S. researchers subjected normal-hearing mice and mice with induced tinnitus to a sudden loud sound, called a startle test, and measured their response to an unexpected gap in the noise frequency.
This is called the startle reflex; it's an automatic response to fear or danger, and it's very hard to fake.