Be careful.
Meaning: This means to tell someone to take care and avoid danger or harm. It's like saying, Please take care and avoid anything that could cause you danger or harm.
Choice of Words: Be is a verb that means to exist or to have a certain quality. Careful means taking care to avoid danger or harm. When you put them together, "Be careful" is a simple instruction asking someone to take care and avoid danger or harm.
Alternative Expressions
Related Expressions