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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.
talk someone or something up
to promote or speak in support of someone or something. I've been talking the party up all day, trying to get people to come. They keep taking up the candidate as if he represented a real change.
talk something up
to promote or advertise something by saying good things about it to as many people as possible. Let's talk the play up around campus so we can get a good audience. I will talk up the play all I can.
Speak in favor of, promote, as in They were talking up their candidate all over the state. [Second half of 1800s]
1. To speak in favor of someone or something; promote someone or something: The mayor talked the candidate up. The publicist talked up the new product.
2. To cause the price or value of a particular investment to increase by publicly talking about it or factors affecting it: Officials talked up the price of gas by warning of a shortage. The oil speculators are talking prices up.