1
general::
1. Language that cannot be understood, gibberish, as in They might have been speaking double Dutch, for all I understood. This usage dates from the 1870s (an earlier version, however, had it as high Dutch) and is heard less often today than the synonym DOUBLE TALK. 2. A game of jump rope in which players jump over two ropes swung in a crisscross fashion.
American Heritage Idioms
2
general::
Phrase(s): double Dutch
1. language or speech that is difficult or impossible to understand. • This book on English grammar is written in double Dutch. I can’t understand a word. • Try to find a lecturer who speaks slowly, not one who speaks double Dutch. 2. a game of jumping rope using two ropes swung simultaneously in opposite directions. • The girls were playing double Dutch in the schoolyard.
McGrawhill's American Idioms And Phrasal Verbs