jīng gōng zhī niǎo
lit. a bird startled by the mere twang of a bow (idiom)
fig. sb who frightens easily, due to past experiences
惊
jīng
to startle
弓
gōng
a bow (weapon)
之
zhī
(possessive particle, literary equivalent of 的[de5])
鸟
niǎo
bird