Someone who’s extremely shy might blush or stammer when talking to a group of people. Shy can also mean “tending to avoid,” like when someone is “camera shy,” or if they “shy away” from being straightforward. The Old English root scēoh, “easily frightened,” originally only referred to a horse, and came from a Germanic root meaning “scare.”
# shy of something
slightly less than, slightly earlier than, or a short distance from something
They scored just shy of 100 goals last year.
I called him only two minutes shy of midnight.
The deer were shy (= unwilling to be near people) and hid behind some trees.
(of a horse) to suddenly move sideways or backwards, especially because of fear
There’s a lot of traffic on the road – I’m sure my horse is going to shy.