Definition of wis in English:

wis

verb

[NO OBJECT]archaic
  • Know well.

    ‘and, you wis, Lord Julian is a hasty man’

Origin

Early 16th century: originally in I wis, alteration of the obsolete adverb iwis ‘certainly’, erroneously interpreted as ‘I know’ (associated with wist, past tense of wit).

Pronunciation

wis

/wɪs/