talk it up

1. To converse (with someone), especially profusely or enthusiastically. I was talking it up with this guy at the bar about his job as a crime scene cleaner. It's so macabre, but I guess someone has to do it! Apparently, upper management is getting annoyed with how much staff are talking it up by the coffee machine throughout the day.

2. To talk about or promote something enthusiastically. Your new bill sound pretty radical, so you need to talk it up to voters. Once they see how much it will benefit them, I think they'll be very happy. I've read the research on that new medication, and you shouldn't believe those commercials talking it up.

talk up

1. To promote, advocate for, or speak favorably of someone or something. In this usage, a noun or pronoun can be used between "talk" and "up." Your former manager has been talking you up quite a bit, so we have high hopes for you here. He talked up the play so much before I went that it didn't end up meeting my expectations.

2. To cause or attempt to cause some commodity or investment to increase in value or price by discussing it or things that affect it. In this usage, a noun or pronoun can be used between "talk" and "up." Economists have been talking up the price of crude oil to avoid profit stagnation in the industry. The industry is filled with players who attempt to talk investments up just to line their own pockets.