Is it ensure, insure, or assure?
late 14c., "to cram with food," probably from Middle Dutch (cf. West Flemish pamperen "cram with food, overindulge;" dialectal German pampen "to cram"), probably from frequentative of root of pap (n.1). Meaning "to overindulge" first attested 1520s. Related: Pampered; pampering.