IPA: //sʌbˈmɪnɪməm//
KK: /sʌbˈmɪnɪməm/
Referring to something that is lower than the lowest acceptable level or standard.
The company paid its workers a subminimum wage, which was below the legal requirement.
Subminimum → It is formed from "sub-" (meaning under or below) and "minimum" (from Latin "minimum", meaning least or smallest). The word "subminimum" refers to a level that is below the least or smallest acceptable standard.
Think of something that is 'under' ('sub-') the 'least' ('minimum') standard — that's what subminimum means.