un ‧ roll /ʌnˈrəʊl $ -ˈroʊl/ BrE AmE verb [intransitive and transitive]
[ Word Family: verb : ↑ roll , ↑ unroll ; noun : ↑ roll , ↑ roller ; adjective : ↑ rolling ]
to open something that was in the shape of a ball or tube, and make it flat, or to become open in this way OPP roll up :
He unrolled the carpet.