I found this line while I was reading:
That commercial said that this product would help me lose weight in one week. I’m not buying into that idea.
While I somehow understood the meaning of the whole sentence by reading between the lines, I could not grasp the whole idea of the phrase when I isolated it from the rest of the sentence.
I tried to find decent definitions on the web but they could not properly give the proper use of this phrase (since there seemed to be different views on it). Could anyone please enlighten me on this topic? Thank you so much! :)