The story
- Proto-Germanic · inherited from*stam-“to trip up; to stammer, stutter”
- English todaystumble
Ultimately from Proto-Germanic *stam- (“to trip up; to stammer, stutter”), thereby related to German stumm (“mute”), Dutch stom (“dumb”). Doublet of stammer. Also related to verb in Dutch stommelen (“to walk silently”).
Etymology from Wiktionary, CC BY-SA 4.0.