Answer:

unhitch

Answer	Crossword Clue
UNHITCH	Release, as a tied-up horse
UNHITCH	Release from a post
UNHITCH	Separate

UNHITCH	Free Dobbin from the traces
UNHITCH	Free the trailer
UNHITCH	Disconnect a trailer
UNHITCH	Let go
UNHITCH	Separate, in a way

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.