〜まみれ
covered in, smeared with
Noun + まみれ (+ の Noun · + になる · + だ)
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まみれ means covered all over in something, usually something liquid, sticky or powdery: 泥まみれ, "covered in mud"; 汗まみれ, "drenched in sweat"; 血まみれ, "covered in blood"; ほこりまみれ, "covered in dust".
It works like a noun: 泥まみれになる, 汗まみれで働く, 油まみれの手.
Compare だらけ (N3), which is "full of" things scattered around: 間違いだらけ, ゴミだらけ. まみれ is a coating that sticks to the surface. You can't say 間違いまみれ, and 汗だらけ sounds odd.
Both are negative in tone: things you'd want to wash off. Figuratively, you'll also see 借金まみれ ("drowning in debt") and 嘘まみれ ("riddled with lies").
Examples
子どもが泥まみれで帰ってきた。
My child came home covered in mud.
汗まみれになって働いた。
I worked until I was drenched in sweat.
彼の服は血まみれだった。
His clothes were covered in blood.
油まみれの手を洗った。
I washed my oily hands.
ほこりまみれの本棚を掃除した。
I cleaned the dust-covered bookshelf.