D defs.my
Entry 1 sense Webster, 1913

Meum

· Me·um · IPA /ˈmi.əm/
01 n. Lit., mine; that which is mine; -- used in the phrase meum et tuum, or meum and tuum; as, to confound meum and tuum, to fail to distinguish…
  1. 1.
    Lit., mine; that which is mine; -- used in the phrase meum et tuum, or meum and tuum; as, to confound meum and tuum, to fail to distinguish one's own property from that of others; to be dishonest.
    “Ancestors . . . generally esteemed more renowned for ancient family and high courage than for accurately regarding the trifling distinction of meum and tuum.” Sir W. Scott.