בלאָזן (Yiddish) comes from Middle High German blāsen, from Old High German blāsan, from Proto-West Germanic blāsan, from Proto-Germanic blēsaną, from Proto-Indo-European bʰléh₁-, from Proto-Indo-European bʰel-, from Proto-Indo-European bʰōl-.
בלאָזן (Yiddish): blow; sulk; plural of בלאָז