To pay out or distribute money, especially from a fund or account; to spend money officially.
From Old French 'disbourser' (dis- 'out' + bourser 'to pay out,' from 'bourse' 'purse,' from Medieval Latin 'bursa'). Entered English in the 16th century with financial/banking meaning.
The word 'disburse' evolved from the image of opening a purse ('bourse') and removing money—it carries the sense of careful, authorized, documented spending rather than casual payment.
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