Is it ensure, insure, or assure?
"about to give birth," 1590s, from Latin parturientem (nominative parturiens), present participle of parturire "be in labor," literally "desire to bring forth," desiderative of parere "to bear" (see pare). Related: Parturiency.
parturient par·tu·ri·ent (pär-tur'ē-ənt, -tyur'-)
Of or relating to giving birth.
About to bring forth young; being in labor.