What is the Latin word for undo?

The usual Latin words for “undo” are soleō, dissolvō, resolvō; also expediō. The right choice depends on the sense; see the distinctions below.

English → Latin

“undo” in Latin

soleōto be accustomed, used to, in the habit of dissolvōto unloose, disunite, separate, dissolve, destroy; to pay, discharge (a debt etc.); to abolish, abrogate, annul resolvōto release, loosen, unloose, unbind, disentangle, relax, dissolve; to enfeeble; to cancel, dispel expediōto free feet from snares; unfasten fetters; lose the shackles; to loosen restraints, unchain, set free, liberate, releas

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

undo

PROP., solvere, dissolvere: resolvere: expedire (to disentangle; all, e.g., a knot). To undo the string by which a letter was fastened, epistolam solvere epistolae vincula laxare (Nep., Paus., 4, 1).

To recall or reverse what has been done, aliquid infectum reddere; in integrum restituere. [Vid: UNDONE.]

To ruin, Vid.

Quick answer

What is the Latin word for undo?: The usual Latin words for “undo” are soleō, dissolvō, resolvō; also expediō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.