see something through—
1. continue to work on smth. until it is completed:
- I had taken on a task, and I was bound to see it through.
2. see the whole of a film, play, etc.:
- I’d much rather see the film through from the beginning, so let’s go to the second showing.
see through something—understand the true nature of smth.; not be deceived by smth.:
- My mother is a very astute woman: she saw right through John’s seeming politeness.
See also: look something through / look through something.