someone's one and only
one and only
1. adjective A phrase used when introducing someone to emphasize that they are famous and uniquely talented. It gives me great pleasure to welcome the one and only Oprah!
2. noun One's only true love. Of course I'll stay true to you while I'm gone—you're my one and only!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
someone's one and onlysomeone's one true love. informal
Farlex Partner Idioms Dictionary © Farlex 2017