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
Maurus	-	Late Roman
Augustin	[ɔ:'gʌstin]
Margie	['ma:dʒi]
Elvira	el-BEE-rah (Spanish), el-VEE-rah (Italian)	Spanish, Italian, Portuguese, German, Dutch, Russian
Cassianus	-	Ancient Roman
Quincy	['kwinsi]