blech /blɛk/exclamation 1verb 1/blɛx/ noun 1forms 4 exclamation1 •(slang) An imitation of the sound of gagging, used to express disgust or disdain.Blech! Look at all those maggots! verb1 •(slang) To have the vomiting reflex triggered. blech /blɛx/ noun1 •(Judaism) A metal sheet used to cover stovetop burners on Shabbat to allow food to be kept warm without violating the prohibition against cooking. formsbleched · bleching · bleches · blechs