combination crossing

20 LETTERS · STARTS WITH C

combination crossing is a valid 20-letter word worth 28 points in Scrabble and 36 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3O1M3B3I1N1A1T1I1O1N1C3R1O1S1S1I1N1G2

3 + 1 + 3 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 2 =28 PTS

DOUBLE WORD → 56TRIPLE WORD → 84

MEANING

What does combination crossing mean?