one side · one aspect · simultaneously... (and...) · one's whole face

His only wish was to see his son one last time.

Everything has two sides: the good side and the bad side. Unfortunately, we usually see only one of them.

Tatoeba: Join the dark side. We have chocolate cookies.

Truth is like a disco ball, and only one of the tiny little mirrors it is made up of is actually yours.

I see a mirror.