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Related to slim down: Weight loss
1. To become more slender; to lose weight. I'm trying to slim down in time for the wedding. I'm not all that overweight, but slimming down a little bit would really help my self-confidence.
2. To make something more slender or less bulky. In this usage, a noun or pronoun can be used between "slim" and "down." The company has been slimming down their smartphones over the past few years. No matter how much I diet or exercise, I just can't seem to slim my thighs down.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
slim someone down
to cause someone to lose weight. They started to slim her down in the hospital, but she gained the weight back as soon as she got out. The dietitian slimmed down all the patients under his care.
to become thinner; to lose weight. You have really slimmed down a lot since I last saw you. I need to eat less so I can slim down. He slimmed down quite a bit after he had his health problem.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To lose weight, as by dieting or exercise: I was overweight, so I decided to slim down.
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.