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psych someone up
Inf. to get someone excited or mentally prepared for something. I psyched myself up to sing in front of all those people. The coach psyched up the team for the game.
Inf. to get mentally ready for something. I have to psych up before the big game tonight. We want to psych up so we can play a good game.
Excite emotionally, as in The chorus was really psyched up for performing in Symphony Hall. [Slang; c. 1970]
To prepare someone mentally for some task or activity: The preview psyched us up to see the film. The coach's speech psyched up the team for the game.