A crisscross is a pattern of lines that cross or intersect. Your favorite shirt might be printed with pink and purple crisscrosses.
You might doodle a crisscross pattern during class or stitch crisscrosses on a quilt. You can also use the word as a verb, meaning to cross in a pattern: "The sidewalks crisscross the city," or "I watched the dogs crisscross the beach." The word dates from the 1800s, from the Middle English crist-cross, or "Christ's cross," which was a mark traditionally made before the alphabet in a schoolbook or primer.