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.

1. To do that which fulfills one's own desires, expectations, or ambitions, especially when failing to consider those of anyone else. It really doesn't matter to me how you arrange the furniture in here, so just suit yourself! Look, Tom and his wife are always going to suit themselves, so don't tie up everything you want to do on this trip with them.

2. A set phrase used in the imperative indicating that the speaker accepts or is indifferent to the other person's decision or preference, especially when it runs contrary to their own desires or expectations. A: "I would just rather not go to a wedding where I won't know anyone." B: "Fine, suit yourself. I'll just go alone." A: "I don't think I'll come to dinner after all." B: "Suit yourself. Should be fun, though."

1. To do the things or behave the way that one advises, dictates, or espouses; to practice what one preaches. My parents always told us to respect each other and not to bicker, but they rarely suited their actions to their words. If you're going to tell your employees not to incur excessive, unnecessary costs, then you had better be prepared to suit your actions to your words.

2. To follow through with what one has one has promised or threatened to do. Don't threaten to quit your job unless you're actually willing to suit your actions to your words. He always talks about these grand adventures he's going to embark upon, but he never suits his actions to his words.