>砂糖をまぶす
「roll in sugar」は「砂糖の中で転がす」が直訳です。
砂糖を入れた器の中で転がす感じです。
例)
When the bread is still hot, but cool enough to handle, brush each loaf with melted butter. Roll in sugar and return to a cooling rack until fully cooled.
〔NewsOK.com-Dec 20, 2016〕
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Roll the cooled cookies in powdered sugar, then store in an airtight container at room
temperature for 1 week. Roll in powdered sugar again, if desired, just before serving.
〔The Register-Guard-Dec 8, 2017〕
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Q: What is a sugarplum, anyway?
A: Do you mean the actual food? Or the actual dancer? It's like figs and almonds crushed and a little citrus sometimes, and it's mashed up into a little ball. And you roll it in sugar. I've never eaten one. I've been one, but I've never had one.
〔Press Herald-Nov 26, 2014〕
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回答は一例です
参考にしてください
ありがとうございました