congratulate (someone) (up)on (something)
To praise someone for an accomplishment or other positive development. I just have to congratulate you on winning the tournament—you totally deserve it. Have you congratulated Fran on her new house yet?
See also: congratulate
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
congratulate someone (up)on something
to compliment or wish happiness to someone because of something. (Upon is formal and less commonly used than on.) I want to congratulate you on your recent success. I congratulate you on your new job!
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.