Definition of unpicket in US English:

unpicket

verb

  • with object To untether (a horse or other animal) from a picket.

Origin

Mid 19th century; earliest use found in Archibald Alison (1792–1867), historian and lawyer. From un- + picket.

Pronunciation

unpicket

/(ˌ)ʌnˈpɪkɪt/