This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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To fold or infold mutually; lap one with another.

"By reason of the shorter line held by the enemy, our line, which was much longer and the colors of each of our battalions being directed against this shorter line, caused our lines to interlap, making it necessary, in order to prevent confusion and crowding, that some of the regiments halt, until the others had passed forward out of the way."

interlapped    interlapping    interlaps