met·a·tag 
(mĕtə-tăg′)
(mĕtə-tăg′)n.
A tag in a markup language that contains descriptive information about a webpage and is not displayed as part of the content of the webpage.
- on the alert
- on the back burner
- on the ball
- on the barrel
- on the barrel/barrelhead
- on the barrelhead
- on the beam
- on the blink
- on the brain
- on the breadline
- on the bubble
- on the bum
- on the button
- on the carpet
- on the cheap
- on the coattails of
- on the contrary
- on the cuff
- on the cusp
- on the defensive
- on the dole
- on the dot
- on the double
- on the drawing board
- on the edge