垫补

垫补	diàn bu	(coll.) to cover a shortfall by using funds intended for another purpose or by borrowing some money / (coll.) to snack
垫	diàn	pad / cushion / mat / to pad out / to fill a gap / to pay for sb / to advance (money)
补	bǔ	to repair / to patch / to mend / to make up for / to fill (a vacancy) / to supplement