noun
weft
WEFT/wɛft/
Threads woven across the lengthwise threads of a fabric.
The red weft passes across the cream lengthwise threads of the loom.

Etymology
Old English weft is related to wefan, “to weave.” It names the threads passed from side to side, interlacing with the lengthwise threads to form fabric.
In context
the warp is made up of individual strands that run the entire length of the fabric and are pulled very tight these make up the length grain the weft fiber runs crosswise over and under
More examples
- She passes the weft over and under the warp threads.
- This cloth has a cotton warp and a wool weft.
- Alternating red and yellow wefts create stripes in the fabric.
Forms
weft · wefts