im·prest /ˈɪmˌprɛst/
  預付款(a.)預付的
  Im·prest v. t. [ imp. & p. p. Imprested; p. pr. & vb. n. Impresting.]  To advance on loan.
  Im·prest n.  A kind of earnest money; loan; -- specifically, money advanced for some public service, as in enlistment.
     The clearing of their imprests for what little of their debts they have received.   --Pepys.
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