hats off to
Congratulations to, as in Hats off to Claire! She's set a new record for the mile. This expression alludes to taking off one's hat as a sign of respect. [Mid-1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.