caution about

caution someone about someone or something

and caution someone against someone or something

to warn someone against someone or something. Haven't I cautioned you about that before? Hasn't someone cautioned you about Daniel?

Name	Pronounced	Usage
Dorsey	['dɔ:si]
Phelim	-	Irish
Astraea	-	Greek Mythology (Latinized)
Sacagawea	-	Native American
WŁAdek	VWAW-dek	Polish
Iason	-	Greek Mythology, Ancient Greek, Greek, Biblical Greek, Biblical Latin