slash your wrists
From Longman Dictionary of Contemporary Englishslash your wristsslash your wriststo cut the veins in your wrists with the intention of killing yourself → slashExamples from the Corpusslash your wrists• On other occasions he had taken a drugs overdose and slashed his wrists.• Last December, he took a drugs overdose and in September slashed his wrists and groin with a smuggled razor blade.• Rather than betray the others, Stockdale broke a window and slashed his wrists with a jagged shard of glass.• Last autumn he came within a few minutes of death when he slashed his wrists with a razor blade.