slimming

US /ˈslɪm.ɪŋ/
UK /ˈslɪm.ɪŋ/
1.

the act of trying to become thinner by eating less food:

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With all the diet-food and books on the market, slimming is big business these days.
1.

Slimming food is food that you can eat without getting fat:

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Have a salad - that's slimming.
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slimslim down