mösse

Etymology
From, from , from. The now predominant Ripuarian form with -ö- is influenced by.

The past tense mot- is peculiar. It has replaced the expected forms, which in the singular would have become homophonous with the respective present forms (*moss, *moß). Original -st- seems to have been irregularly reduced to -t-. However, the pronunciation alongside  hints at an influence by (regularly explainable) past tense forms of,. The two verbs can be semantically close in negation; compare English I not ≈ I  not.

Verb

 * 1)  must; to have to; should