1st person singular present indicative of nisīdati; the form nisinnomhīti appears to be a non-standard or scribal variant for nisīdāmi 'I sit down', possibly reflecting dialect or textual corruption
Analysis. ni- (down, into) + √sad (sit), with -ti ending. The prefix ni- reverses the direction of sitting, emphasizing the downward motion of settling.
Etymology. From ni + √sad (to sit). Compare Sanskrit sad-, Latin sedēre, English sit. The prefix ni- (down, into) adds the sense of settling or descending into a position. Related: nisīdana (sitting down), nisidittha (sat down).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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