veto

[1]	stop , block , deny , ban , turn down , reject , disallow , rule out , quash , prevent , prohibit , interdict , taboo , outlaw , proscribe , preclude , (Colloq) put the kibosh on , kill , nix
[2]	blackball , negative
[3]	forbid , prohibit , interdict , proscribe , disallow , nix

[1]	denial , ban , stoppage , block , embargo , turn-down , rejection , disallowance , quashing , prevention , prohibition , interdiction , taboo , proscription , preclusion , vetoing , (Colloq) killing , nixing