What does the idiom "sell me" mean?

English Language Tests, Intermediate level

ESL/EFL Test #707 [color=blue]“English Slang Idioms (449)”, question 2

“Paul’s been trying to me on one of those new thin air mattresses for camping, and I think he has a point; they seem to make camping more comfortable andthey’re not expensive,” Greg said to Marisol.

(a) buy
(b) trade
(c) invest
(d) sell

English Language Tests, Intermediate level

ESL/EFL Test #707 [color=blue]“English Slang Idioms (449)”, answer 2

“Paul’s been trying to sell me on one of those new thin air mattresses for camping, and I think he has a point; they seem to make camping more comfortable andthey’re not expensive,” Greg said to Marisol.

Correct answer: (d) sell
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hi
what does sell me idiom mean?
jyo

Hello Jyo,
“Sell me” means that someone is trying to convince you to buy something or he/she is trying to convince you into believing their story etc. In other words, if someone is trying to “sell you” on something, they are trying to persuade you into doing something.