uncross

un- +‎ cross

uncross (third-person singular simple present uncrosses, present participle uncrossing, simple past and past participle uncrossed)

1. (transitive) To move something, especially one's arms or legs, from a crossed position.
2. (transitive) To undo the crossing or traversal of.
   • 2014, DeAnna Holland, No Place Like Home:

     I want nothing more than to run through the crowd of people and throw myself into his arms, but I can't. You can't rewrite the past, and once lines have been crossed, you can't uncross them.

   • 2015, Abigail Tarttelin, Flick, page 201:

     “Don't call me stupid. I mean it. My parents don't ever call each other names. Name-calling and being nasty just breaks things and crosses lines you can't uncross.”