slimming adjective 1noun 1forms 3 adjective1 •Making a person seem or become slimmer.She bought the jeans without trying them on because the salesperson said they were slimming.He's trying to lose weight by drinking slimming tea. noun1 •The process of making or becoming slimmer.We have become accustomed to Thatcherite slimmings of the system — massive ward closures punctuated from time to time by the royal opening of an Aids unit for ten patients, but here is something new. — 1990 formsslimmings · more slimming · most slimming