Definition of unhasp in US English:

unhasp

verb

[with object]archaic
  • Unfasten.

    • ‘As she quietly awaited the next move, she slipped her hands over her shoulders, unhasping her magnificent chain, with the poison-infused spikes.’
    • ‘He tried to keep calm and endeavored to unhasp the casement.’
    • ‘This time, I remembered I was lying in the oak closet, and i heard distinctly the gusty wind, and the driving of the snow; I heard, also, the fir-bough repeat its teasing sound, and ascribed it to the right cause; but it annoyed me so much, that i resolved to silence it, if possible; and, I thought, I rose and endeavoured to unhasp the casement.’
    • ‘The lower pane of glass in the top sash was broken, so that any person by a hand might open the fastening of the sash, and when the sash was unhasped they might throw up the lower sash, and a block of wood was placed outside to enable them to get in.’
    • ‘The opener will endure frost without any problems, but if you leave it on, you may forget to unhasp the window.’

Pronunciation

unhasp

/ˌənˈhasp/