bid bond
noun[C]
ukusanamountofmoneythat acompanythat makes thelowestbidto do aparticularpieceofworkpromisestopayif it then does not do thework:
Thepurposeof thebidbondis topreventfrivolousbidders.
Abidbondis often in theformof afinancialguaranteefrom abankorinsurancecompany.