from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To unhitch; to unharness.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To unbitch; to unharness.
from The Century Dictionary and Cyclopedia
- To unhitch; unharness.
un- + tackle (Wiktionary)
The gipsy man gave a little call, as he backed his cart into the quarry, and an elderly man came out to help him untackle.