• Webster's Revised Unabridged Dictionary
    • v. t Untackle To unbitch; to unharness.
    • ***
Chambers's Twentieth Century Dictionary
    • v.t Untackle un-tak′l to unhitch.
    • ***


Webster's Revised Unabridged Dictionary
1st pref. un-, + tackle,


In literature:

He knew a million Chances untackled yet.
"Rung Ho!" by Talbot Mundy
Jimmy joined the gang and worked like a Trojan, helping wherever a man was needed, shifting ballast, untackling the boats, handling the pump.
"The Stolen Singer" by Martha Idell Fletcher Bellinger
Under this cover, taking the ball he passed down the middle, Silent and swift, unseen, unnoticed, unblocked, and untackled.
"The Wit and Humor of America, Volume IV. (of X.)" by Various
And without another thought she ran off into the house, leaving him to untackle the horse.
"The Rainbow" by D. H. (David Herbert) Lawrence
Carolyn May, who had untackled Prince on the porch, stood by, and watched Miss Amanda's skilful fingers in wonder.
"Carolyn of the Corners" by Ruth Belmore Endicott