Step 1: Understanding the Concept:
The question asks to identify a defect that occurs specifically during the weaving process on a loom.
Step 2: Detailed Explanation:
(1) Slub: A slub is a thick, soft lump in a yarn. It is a yarn defect, not a weaving defect, although it will be visible in the woven fabric. Sometimes slubs are created intentionally for a textured effect.
(2) Colour run: This is a dyeing or finishing defect where dye bleeds from one area to another, typically during washing or wet processing. It does not occur during weaving.
(3) Chafe: This refers to damage on the fabric surface caused by rubbing or abrasion. While it can occur during weaving due to friction, it is a more general term for surface damage that can happen at any stage.
(4) Broken end: In weaving terminology, an "end" is a single warp thread. A broken end is a warp thread that has snapped on the loom during the weaving process. This stops the weaving and, if not repaired correctly, leaves a distinct flaw where a warp thread is missing for a certain length. This is a classic and direct defect of the weaving process itself.
Step 3: Final Answer:
A "Broken end" is unequivocally a defect that originates during the weaving process.