gird up loins
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gird (up) (one's) loins
To prepare oneself to face or contend with something. You better gird your loins in preparation for another holiday with my dysfunctional family! They better gird up their loins—the weather up there is no joke.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
gird up one's loins
Fig. to get ready, especially for hard work; to prepare oneself (for something). Well, I guess I had better gird up my loins and go to work. Somebody has to do something about the problem. Why don't you gird up your loins and do something?
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.