Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 intransitive v. To multiply the numerator of one of a pair of fractions by the denominator of the other.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 v. To set the product of the extremes of a proportion equal to the product of its means.
Etymologies
Sorry, no etymologies found.
Examples

Step 4 Moving leftward, we now crossmultiply the first two columns, (3 × 5) + (7 × 8) = 71, plus the 9 carried above.

The best thing that ever came out of reviewing for the GRE is learning how to crossmultiply.

The Yankees are six games out with six games to play, making their magic number, hmm, let's see, carry the one, crossmultiply, divide by x, aaaanndd … I feel like a crazy person for even bothering to note this but I can't help it.

The "crossmultiply" method say to multiply the top and bottom numbers crosswise.

All that these problems are asking you to do is crossmultiply all of the terms, and then combine them to simplify. x2 + 4 + 4x (x+2) squared = (x+2) times (x+2) (xtimesx) + (xtimes2) + (2timesx) + (2times2) xsquared+2x+2x+4 xsquared+4x+4
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