in ‧ vert /ɪnˈvɜːt $ -ɜːrt/ BrE AmE verb [transitive] formal
[ Date: 1500-1600 ; Language: Latin ; Origin: invertere , from vertere 'to turn' ]
to put something in the opposite position to the one it was in before, especially by turning it upside down (=the bottom is on the top and the top is on the bottom) ⇨ upside down