Help With Custom Script and Custom Field Check Box

ON ITEM FORM,
Suppose I have 2 custom check boxes named “Gate” and “Globe” and a custom added read only field “description_2”

If i check the Gate, then the description_2 field shall show as Gate
and if i select the Globe check box, then the description_2 shall show Globe in read only.

is there a custom script with this anyone can please help.