kiboshEnglishOxford American Thesauruskibosh noun informal □ put the kibosh onhis boss put the kibosh on the deal: put a stop to, check, curb, stop, halt, bring to an end, put an end to, nip in the bud, quash, block, cancel, scotch, thwart, frustrate, prevent, quell, suppress; informal squelch, put paid to, scupper, spike, stymie.