"Lazy Line" or the diagonal or vertical edge between segments of weave in a Navajo rug or blanket.

Pueblo textile weavers sat on a bench to weave.  Pueblo weavers interlaced the wefts continuously from edge to edge of the loom. 

On the other hand, Navajo textile weavers sat on the ground.  Instead of getting up and down to weave from one edge to the edge of the textile, Navajo weavers tended to weave the textile in segments.  The Navajo weaver usually continued to weave upward in one area, dropping back one warp with each weft pick, thus leaving a diagonal edge to that segment.  Then the weaver would move over and weave another segment against the first one, filling the gap left by the preceding unit and leaving a subtle diagonal line in the fabric.  This has come to be termed a "lazy line".  Lazy lines may cross both background color and pattern areas. 

Weaving in obvious segments divided by lazy lines is predominantly a Navajo trait.  We rarely see lazy lines in Pueblo weavings.

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