undo

To reverse or erase; annul.

To untie, disassemble, or loosen.

To open (a parcel, for example); unwrap.

To cause the ruin or downfall of; destroy.

To throw into confusion; unsettle.

To come open or unfastened.

To leave unperformed or unexecuted: usually in opposition with do.

To put back into a former condition; reverse, as something which has been done; annul; bring to nought.

To untie or unfasten; unloose; unfix; open.