1520s, from Medieval Latin imbursare, from assimilated form of in- "into, in, on, upon" (see in- (2)) + bursa "purse." Related: Imbursement.
Online Etymology Dictionary, © 2010 Douglas Harper
Examples from the Web for imburse
Our trusty friend, stir not, nor imburse any; but let us vary the chance, and speak without disjunctives.Gargantua and Pantagruel, Complete.