checkboxnoun [ C ]
uk/ˈtʃekbɒks/usUS UK tick boxa small box on a paper form to put a check mark in:
They voiced concerns about problems with the citizen checkbox on voter-registration forms.
IT a small box on a computer screen that you click on to show a choice, to open or close a file, etc.:
To prevent a program from starting up, clear the check box next to it, click OK, and reboot.