Nouns

(n)rebate, discounta refund of some fraction of the amount paid
(n)rabbet, rebatea rectangular groove made to hold two pieces together

Verbs

(v)rebategive a reduction in the price during a sale“The store is rebating refrigerators this week”
(v)rebatecut a rebate in (timber or stone)
(v)rebatejoin with a rebate“rebate the pieces of timber and stone”