be careful

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be careful

To act cautiously. Usually issued as a warning. Be careful when you go out in the city at night. Be careful with that box—don't bang around my glassware! Be careful! Stay with the tour guide!
See also: careful

Be careful

 
1. an instruction to take care in a particular situation. Bill: I'm going to the beach tomorrow. Sally: Be careful. Use lots of sunscreen! Jane: Well, we're off to the Amazon. Mary: Heavens! Be careful!
2. a way of saying good-bye while cautioning someone to take care. John: See you around, Fred. Fred: Be careful. Alice: Well, I'm off. John: Bye, Alice, be careful.
See also: careful
References in classic literature ?
"Weigh your words well, my lord," said Raoul, haughtily: "my nature is not such that its vivacities need checking; whilst you, on the contrary, are descended from a race whose passions are suspected by all true Frenchmen; I repeat, therefore, for the second time, be careful!"
"O, George, for my sake, do be careful! Don't do anything wicked; don't lay hands on yourself, or anybody else!
"Take your guns with you!" said the doctor; "take your guns, and be careful!"
Kennedy; be careful! The lives of all depend upon the life of one."