Definition of yesternight in US English:

yesternight

noun

archaic
  • Last night.

    • ‘She has avenged the feud for your violent killing with hard hand clasps of Grendel yesternight for diminishing and destroying my people for so long.’
    • ‘Last night, ah, yesternight, betwixt her lips and mine’
    • ‘I hid me in the bushes by the gate yesternight, for I saw Christophero waiting there.’
    • ‘She bid me tell you yesternight that she not be disturb'd.’
    • ‘Just yesternight did I confess my love to Odette… and I must now go into battle, perhaps never to see her again!’

adverb

  • During last night.

Pronunciation

yesternight

/ˈyestərˌnīt/