bulk up

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bulk up

To boost in size or strength. Most of the wrestlers are bulking up for the weigh-in on Thursday. That country seems to be bulking up their military presence in the region.
See also: bulk, up
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

bulk up

or bulk out
v.
1. To increase in size or weight: The weightlifters are exercising in order to bulk out.
2. To cause someone or something to increase in size, weight, or degree: I hope all the food I'm eating doesn't bulk me out too much. All of the new employees have bulked out the company's payroll.
See also: bulk, up
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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