watch this space

factor space

A space obtained from another by identification of points that are equivalent to one another in some equivalence relation.

keep a close watch

to pay careful attention to a situation or a thing, so that you can deal with any changes or problems.

keep watch

To guard; to watch over someone or something.

on one's watch

During the period of time when one is in a position of authority or responsibility.

set one's watch back

To ponder or experience a past time.

set one's watch by someone

To know the current time by observing a very punctual and reliable person going about their regular routine.

space out

To become distracted or disoriented; to lose attention or focus.

waste of space

An utterly worthless person; one who, as it were, is unworthy of the space which they occupy.