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Webster 1913 Edition

Noun.

A swath.

[Obs.]

Tusser.

A piece, pattern, or sample, generally of cloth.

Halliwell.

Jamieson.

swatch ‎(plural swatches)

A piece, pattern, or sample, generally of cloth or a similar material.
He held a swatch of the wallpaper up to see if the colors would match the room.

a piece, pattern, or sample

swatch ‎(third-person singular simple present swatches, present participle swatching, simple past and past participle swatched)

To create a swatch.
Swatching is important in knitting to obtain the correct gauge.