defective - faulty, imperfect, incomplete⏎
defraud - trick, be dishonest, obtain money illegally⏎
coupon - voucher⏎
adopt - accept, use, buy⏎
concept - idea, principle, understanding⏎
alliance - agreement, partnership⏎
document - record, official paper⏎
check - stop, control, examine, investigate, halt make certain⏎
accessible - reachable, available, easily entered⏎
dilute - reduce, lessen effectiveness weaken⏎