CASH DISCOUNT is a refund of some fraction of the amount paid because the purchase price is paid by the buyer in cash, as opposed to making the purchase on credit or, sometimes, credit card or check.
ONLINE SERVICE FEE see SERVICE CHARGE.
OVERHAUL is to rebuild, make repairs or adjustments to, e.g. an overhaul expense would be the expenditures incurred in making the subject item(s) acceptable once again.
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