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somnambulate (v.)

1821, probably a back-formation from somnambulism, from French somnambulisme, from Modern Latin somnambulus "sleepwalker," from Latin somnus "sleep" (from PIE root *swep- "to sleep") + ambulare "to walk" (see amble (v.)). Related: Somnambulated; somnambulating.

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Definitions of somnambulate from WordNet

somnambulate (v.)
walk in one's sleep;
Synonyms: sleepwalk
From wordnet.princeton.edu