uncheck

un- +‎ check.

uncheck (third-person singular simple present unchecks, present participle unchecking, simple past and past participle unchecked)

1. (computing) To remove a checkmark.

   Uncheck the “save my password” box.

   • 2008 March, Jim Cheshire, “Using Web Page Views”, in Using Microsoft Expression Web 2, special edition, Indianapolis, Ind.: Que Publishing, Pearson Education, →ISBN, page 138:

     If you uncheck either of these check boxes, [Microsoft] Expression Web 2 will create all new Web pages with uppercase tag names and/or attributes. Current Web standards require that HTML tag names and attributes be lowercase. Therefore, pages created with either of these boxes unchecked will not be compatible with existing standards.

2. (travel, aviation) To remove a previously checked-in passenger from the check-in system, allowing changes to the ticket.

• (computing): untick
• (aviation): offload

• check

• unchecked (adjective)