1. watch out - Verb
2. watch out - Interjection
be vigilant, be on the lookout or be careful
Source: WordNetWhile you are struggling for money to buy various things, watch out that you don't lose the things that can't be bought with money. Source: Internet
Watch out for the fellow who talks about putting things in order! Putting things in order always means getting other people under your control. Denis Diderot
I think you've got to watch out for anybody in high school who says he wants to become an economist. Thomas J. Sargent
Watch out lest the canoe land on a rocky reef. Hawaiian Proverb
We keep an eye on the scorpion and the serpent, but we do not watch out for the millipede. Sicilian Proverb
Watch out for the unexpected mushroom. Sicilian Proverb