Where does “dismounteth” come from?

dismounteth (English) comes from English dismount, from Old French desmonter — to cause to dismount.

dismounteth (English): third-person singular simple present indicative...

Definitions

  1. third-person singular simple present indicative...

Ancestry of “dismounteth”, step by step

dismounteth traces back through two separate lines of ancestry.

via English dismount

StepLanguageWordMeaning
1EnglishdismountTo get off; To make unavailable for use; To...
2Old Frenchdesmonterto cause to dismount

via English eth

StepLanguageWordMeaning
1EnglishethA letter introduced into Old English to...
Every word from Old French desmonterEvery word from English dismount