Definitions for overtrumpˌoʊ vərˈtrʌmp, ˈoʊ vərˌtrʌmp
Random House Webster's College Dictionary
o•ver•trumpˌoʊ vərˈtrʌmp, ˈoʊ vərˌtrʌmp(v.t.)
to trump with a higher trump card than has already been played.
(v.i.)to play a higher trump card than has already been played.
play a trump higher than (one previously played) to the trick
To play a higher trump card than the previous one in a trick