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Etymology
Dialectal variant of or  in all senses. How “to sow” or “to strew”, with meaning “offspring” in, can mean “to create”, needs no explanation. For the coloration meaning apparently is the original and meant color specks figuratively strewn, ultimately becoming a dead metaphor like  which is used for skin rashes and the like.

Verb

 * 1) to create

Verb

 * 1) to become white, to have whiteness intermixed into the saturated colour
 * 2)  to be or become rusty

Noun

 * 1) whiteness intermixed into saturated colour
 * 2)  rust