Is it ensure, insure, or assure?
1820s, "act of taking back," also "retraction of a statement," from withdraw + -al (2). Earlier words in the same sense were withdrawment (1640s); withdraught (mid-14c.). Meaning "removal of money from a bank, etc." is from 1861; psychological sense is from 1916; meaning "physical reaction to the cessation of an addictive substance" is from 1929 (with an isolated use from 1897; withdrawal symptoms is from 1924). As a synonym for coitus interruptus from 1889.
withdrawal with·draw·al (wĭð-drô'əl, wĭth-)
Detachment, as from social or emotional involvement.
Discontinuation of the use of an addictive substance.
The physiological and mental readjustment that accompanies such discontinuation.
A pattern of behavior, observed in schizophrenia and depression, that is characterized by a pathological retreat from interpersonal contact and social involvement and that leads to self-preoccupation.