un- + check.
uncheck (third-person singular simple present unchecks, present participle unchecking, simple past and past participle unchecked)
- (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.
- (travel, aviation) To remove a previously checked-in passenger from the check-in system, allowing changes to the ticket.