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To loose; to open; to take to piece; to unfasten; to untie; hence, to unravel; to solve; as, to undo a knot; to undo a puzzling question; to undo a riddle. Tennyson. Pray you, undo this button. Shak. She took the spindle, and undoing the thread gradually, measured it. Sir W. Scott.

To loosen from a fastening; to detach from anything that holds; to unsettle; as, to unfix a bayonet; to unfix the mind or affections.

To separate, part, or open, as anything fastened with glue. She stretches, gapes, unglues her eyes, And asks if it be time to rise. Swift.

To free from being hitched, or as if from being hitched; to unfasten; to loose; as, to unhitch a horse, or a trace.

To loose from a hook; to undo or open by loosening or unfastening the hooks of; as, to unhook a fish; to unhook a dress.

To separate or undo, as links; to uncoil; to unfasten. Shak.

To unfasten, as what is locked; as, to unlock a door or a chest.

To become unfastened; to lose all connection or union.

Immovable. "Steadfast, unmovable." 1 Cor. xv. 58. Locke.

To remove the nails from; to unfasten by removing nails.

To remove a peg or pegs from; to unfasten; to open. Shak.

To loose from pins; to remove the pins from; to unfasten; as, to unpin a frock; to unpin a frame.

To deprive of a stock; to remove the stock from; to loose from that which fixes, or holds fast.

To free from fastening or from restraint; to let loose; to unbind. Though you untie the winds, and let them fight Against the churches. Shak. All the evils of an untied tongue we put upon the accounts of drunkenness. Jer. Taylor.

To loose from a truss, or as from a truss; to untie or unfasten; to let out; to undress. [R.] Dryden.

To fasten with a bar. [R.]

To hasp or faster up; to close; as, sleep uphasps the eyes. [R.] Stanyhurst.

put in competition; to bandy. [Obs.] She hung about my neck; and kiss on kiss She vied so fast. Shak. Nor was he set over us to vie wisdom with his Parliament, but to be guided by them. Milton. And vying malice with my gentleness, Pick quarrels with their only happiness. Herbert.

Daboia, and other genera of the family Viperidæ. There came a viper out of the heat, and fastened on his hand. Acts xxviii. 3.

A vulgar phrase or expression. A fastidious taste will find offense in the occasional vulgarisms, or what we now call "slang," which not a few of our writers seem to have affected. Coleridge.