To mark or variegate with flecks; to speckle or spot something.
From 'fleck' (a small spot or mark) + the agent suffix '-er,' forming a verb meaning 'to create flecks on something.'
English verbs made from nouns with '-er' are everywhere—fleck becomes flecker, just like spot becomes spotter, but flecker is rarer and more poetic, which is why it sounds fresh when used.
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