Picture two lines laid over each other so they meet and cross. Now do it again, and again, in different directions, until the surface is covered with small crossings. That mesh is the picture the whole word carries. It does not matter what the lines are made of. They can be cracks in a wall, tape on a window, bamboo in a fence, strips of dough on a pie, or the route a person traces walking back and forth across a city. One crossing is only a cross. Many crossings, going different ways, is a crisscross.
From the word’s history
Wiktionary traces the word to Middle English crist-crosse, crists-crosse, literally 'Christ's cross', and notes that by surface analysis it looks like an apophonic reduplication of cross. The doubling in the form matches the doubling in the meaning: not one cross, but crossing repeated.
依 Wiktionary，這個字來自中古英語 crist-crosse，字面是「基督的十字」；從字面結構看，它也像是 cross 的疊音重複（criss- 加 cross）。字形上的重複，正好對上意思上的重複：不是一個十字，而是一再交叉。
Wiktionary, "crisscross"
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