Synonym: abolish, destroy, disassemble, dismantle, spoil, take apart, unfasten, untie, wreck. Similar words: run down, round off, sound off, undoubtedly, round and round, candor, rondo, random. Meaning: [‚ʌn'duː] 
v. 1. cancel, annul, or reverse an action or its effect 2. deprive of certain characteristics 3. cause the ruin or downfall of 4. cause to become loose 5. remove the outer cover or wrapping of.
v. 1. cancel, annul, or reverse an action or its effect 2. deprive of certain characteristics 3. cause the ruin or downfall of 4. cause to become loose 5. remove the outer cover or wrapping of. 
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1, Can you undo this knot?
2, Can someone help me to undo my seat belt?
3, I had to undo several rows of knitting.
4, Please undo the package.
5, I managed secretly to undo a corner of the parcel.
6, Mention of the boy would still undo her sometimes.
7, I can't undo my shoelaces.
8, His pride will undo him some day.
9, She prepared to undo the band of cloth around his arm which had served as tourniquet.
10, It's not too late to try and undo some of the damage.
11, Try and undo the screw to get the whatsit off.
12, Sammy took off his coat and proceeded to undo his boots.
13, He tried to undo the knot by picking at it with his fingers.
14, It's very difficult to undo the damage that's caused by inadequate parenting in a child's early years.
15, She knew it would be difficult to undo the damage that had been done.
16, We cannot undo the damage of a lifetime in only 30 days.
17, If Michael won, he would undo everything I have fought for.
18, I undo the zip on my jeans.
19, There wasn't any way Evelyn could undo the damage.
20, Maybe there was still time to undo the damage?
21, Cross-breeding will undo all that work.
22, Confidently,[http://sentencedict.com/undo.html] her hands sought to undo the brassiere.
23, I can't undo the string!
24, She began to undo the third shirt.
25, But it is not too late to undo that damage.
26, The knot was fastened in such a way that it was impossible to undo.
27, If you want to repair the wheels you just undo the four nuts.
28, If a medicine is taken again too soon, it may undo all the good that has been done.
29, He had eaten so much that he had to undo his belt a couple of notches.
30, True it is, that what the Parliament doth, no authority upon earth can undo.
More similar words: run down, round off, sound off, undoubtedly, round and round, candor, rondo, random, hand on, hand out, off and on, kind of, vendor, send out, condone, find out, stand out, and others, fend off, in and out, abandon, window, indoors, abandoned, hand over, demand of, endowed, turn down, endorse, be fond of.