ˈslim-in
Also slim in.
[f. slim v. + -in3.]
A course of (usu. sponsored) slimming undertaken by several people in competition with or in support of one another.
| 1973 Inverness Courier 31 July 5/4 A sponsored ‘slim⁓in’..recently raised {pstlg}15. 1977 Cornish Times 19 Aug. 10/1 The sponsored ‘slim in’ was won by Mrs V. Humphries. |