suit oneself to do
1. verb 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. expression An imperative used to indicate 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."
See also: suit
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
suit oneself to do something
one's own way; to do something to please oneself. If he doesn't want to do it my way, he can suit himself.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.