unbear

From un- +‎ bear.

unbear (third-person singular simple present unbears, present participle unbearing, simple past unbore, past participle unborne)

1. (transitive) To remove or loose the bearing rein of (a horse).
   • 1852 March – 1853 September, Charles Dickens, Bleak House, London: Bradbury and Evans, […], published 1853, →OCLC:

     […] he dashes to his destination at such a speed that when he stops the horse half smothers him in a cloud of steam.
     "Unbear him half a moment to freshen him up, and I'll be back."

• unbare, urbane