From Longman Dictionary of Contemporary Englishcut your own throatcut your own throatHARM/BE BAD FORto behave in a way that will cause harm to yourself, especially because you are very offended or angry about something He’d just be cutting his own throat if he left now. → cut
Examples from the Corpus
cut your own throat• It would be silly to give up your job now -- you'd just be cutting your own throat.• You would be cutting your own throat by refusing to accept their generous offer.• To cut our own throats so thoroughly and so hopelessly would require colossal stupidity.cut your own throatcut your own throatHARM/BE BAD FORto behave in a way that is certain to harm you, especially because you are proud or angry → throatExamples from the Corpus
cut your own throat• To cut our own throats so thoroughly and so hopelessly would require colossal stupidity. 