Bleh vs. Blech — What's the Difference?

(slang) Used to reflect general indifference to a situation or topic.

A blech (from the Yiddish word בלעך (blekh) meaning "tin" or "sheet metal") is a metal sheet used by many observant Jews to cover stovetop burners (and for some, the cooker's knobs and dials) on Shabbos (the Jewish Sabbath), as part of the precautions taken to avoid violating the halachic prohibition against cooking on the Sabbath.

(slang) An expression of mild disgust, possible imitative of vomiting

(slang) An imitation of the sound of gagging, used to express disgust or disdain.

(slang) Mildly uncomfortable; not good.

(slang) To have the vomiting reflex triggered.

(Judaism) A metal sheet used to cover stovetop burners on Shabbat to allow food to be kept warm without violating the prohibition against cooking.