1. noun /tæɡ/
a) A small label.
The tag was applied at second for the final out.
b) A game played by two or more children in which one child (known as "it") attempts to catch one of the others, who then becomes "it".
The <code><title></code> tag provides a title for the Web page.
2. verb /tæɡ/
Regularly tag the rear ends of your sheep.
He really tagged that ball.
Wikipedia foundation.