crisscross: [16] Crisscross is an alteration of Christscrosse, a term used from the 16th to 18th centuries for the figure of a cross (not specifically, as the name would seem to suggest, the crucifix). Gradually the original signification of the first syllable came to be lost, and the term fell into the pattern of reduplicated words (such as flipflop, singsong) in which a syllable is repeated with variation of the vowel. This may have contributed to the broadening of the word’s meaning to ‘pattern of repeated crossings’, which happened in the 19th century. [crisscross etymology, crisscross origin, 英语词源]