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1. To put on a uniform for a specific job, role, or activity. We're going to review some gameplay footage of our opponents before we suit up. The police chief told me not to suit up while the investigation into the incident proceeded.
2. slang To wear a formal suit for a social occasion. My best man and two groomsmen need to go suit up and start getting ready for the ceremony. Jim likes to suit up anytime we all go out, even if it's just to grab a few beers at the local pub.
suit (oneself) up
to get into one's uniform, especially an athletic uniform. The coach told the team to suit up for the game by three o'clock. It's time to suit up! She suited herself up and went out on the court.
Put on clothes for a particular activity, as in Come on, fellows, it's time to suit up for the hockey game. [Mid-1900s]
1. To put on clothing designed for a special activity: We suited up in our riding clothes.
2. To dress someone in clothing designed for a special activity: We suited up the children in their Halloween costumes. The soldiers were suited up for night patrol.