Watch someone/something carefully to make sure everything is all right
If you keep an eye on someone or something, you watch him/her/it carefully because you don't trust him/her or want to see what happens.
Example:
He can be very dangerous. Always keep an eye on him.
They have been keeping an eye on the volcano day and night for more than a year.
Picture:

This picture was electronically drawn by Erika Aoyama on November 27, 2003.
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Last modified on December 24, 2003