Quick answer
Somebody away from where they belong is exposed in a way they may not feel yet. The verse uses one word twice to make the comparison exact.
Read both lines
The Hebrew repeats the participle: the bird wanders, the man wanders, same verb, so the two halves are not merely similar but identical in the thing being described. That precision is the craft.
A bird out of its nest is not doing anything wrong. It is simply somewhere it cannot be protected and where nothing is stored for it, and the danger is entirely situational. The verse's reticence is deliberate: it does not say why he left, whether he was right to, or what happens next. It observes exposure rather than assigning fault, and it applies as readily to a man who was driven out as to one who walked. The catalog reads it as descriptive for that reason.
Related: Proverbs 27:10 · Proverbs 21:16 · Proverbs 6:5
New King James Version®, Copyright © 1982, Thomas Nelson. All rights reserved. Full copyright information. Scripture provided by API.Bible.
Go Deeper
If this verse has been used to put weight on you that it was never carrying, ask about it directly.