Where does “blabmouth” come from?

blabmouth (English) comes from English mouth, from Middle English mouþ, from Old English mūþ, from Proto-West Germanic *munþ, from Proto-Germanic munþaz, from Proto-Indo-European men- — to think, mind; spiritual activity; to stay,...

Ancestry of “blabmouth”, step by step

blabmouth traces back through two separate lines of ancestry.

via English mouth

StepLanguageWordMeaning
1EnglishmouthThe opening of a creature through which food is...
2Middle EnglishmouþAlternative form of mouth
3Old Englishmūþmouth, opening, door, gate
4Proto-West Germanic*munþmouth
5Proto-Germanicmunþazmouth
6Proto-Indo-Europeanmen-to think, mind; spiritual activity; to stay,...

via English blab

StepLanguageWordMeaning
1EnglishblabTo tell tales; to gossip without reserve or...
2Middle Englishblabbento talk foolishly
3Middle Englishblabbeidle talk; talebearer
Every word from Proto-Indo-European men-