Shortened form of you see (meaning you comprehend). (phrase)
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Use "y'see" in a sentence
"You just can't use the gift card to make an order, they're only good at Amazon y'see."
"Now, y'see, I don't really watch much TV either, but my girlfriend has been attempting to get me into some stuff of late."
"And if they do make it an option along with private insurance (y'see, "option" means it's voluntary -- you get to choose) and the public option is better, well, who cares if it makes the private insurers nervous?"