- undetermined nitrogen,
- undifferentiated type fever,
verb (used with object), un·did, un·done, un·do·ing.
Origin of undo
Examples from the Web for undid
We undid it and hung it up in the kitchen, right next to a Nancy Newsom ham, the smell absolutely intoxicating.
He went back to the bed, undid the tiny pearl buttons down the front of the bridal gown, pulled it open.It Could Be Anything|John Keith Laumer
The Prince stood by the window and undid the packet with trembling hands.Jennie Baxter, Journalist|Robert Barr
She stroked Pepper's nose while Austen undid the hitch-rope from around his neck.Mr. Crewe's Career, Complete|Winston Churchill
verb -does, -doing, -did or -done (mainly tr)
Old English undon "to unfasten and open" (a window or door), "to unfasten by releasing from a fixed position," from un- (2) + do (v.). The notion is of "to annul something that was done." Related: Undone; undoing.