''On their Toes''

[Bubblegum]

If somebody was told to ''be on their toes'' with somebody else, what does this mean?

[B00]

Be wary, on your guard around that other person. That they aren't to be trusted.

[Bubblegum]

Thanks because someone jsut warned me that, and i didnt quite understand. So i take it as a bad thing!

[B00]

It is a bad thing- if person A told you that about person B, it means don't trust person B.

[Quizmonster]

I'm afraid I don't agree with Boo on this. To be 'on one's toes' is to act in an alert and eager manner, often to impress the person concerned rather than worried about him/her.
"The Managing Director of the company is visiting us today, so I expect all of you to be on your toes" is a typical sentence you might hear the phrase used in. In other words, "Be alert and show lots of enthusiasm so that the BIg Boss goes away with a good impression of us here."