To see through is to spot the truth behind a trick, or to finish what you started. See through the excuse, see through him at once, see the job through.
The two senses are unrelated and both common, and only the object separates them. There is a warm third use as well, since money or friends can see somebody through a hard year.
1phrasesee throughTo spot the truth behind someone's trick; also, to finish what you started.
“Anybody could see through an excuse that thin.”
see through is a phrase.
Practised in Phrasal Verbs