have to go some
have to go some to (do something)
To have to put forth great effort in order to do something. You'll have to go some to beat her time—she really swam a great race.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
have to go some (to do something)
to need to try very hard to accomplish something. That's really great, Jean! I have to go some to do better than that!
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.