Origin: 1250–1300; Middle English suste(i)nen < Anglo-French sustenir,Old French < Latin sustinēre to uphold, equivalent to sus-sus- + -tinēre, combining form of tenēre to hold
late 13c., from O.Fr. sustenir "hold up, endure," from L. sustinere "hold up, support, endure," from sub "up from below" + tenere "to hold" (see tenet).