She is up the duff.
Source: tatoeba (1545456)
Ranked by relevance and common usage.
Keep "duff" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
If two options seem close, choose the one that best matches the audience and purpose of the sentence.
Choose a synonym only if it keeps the core idea of "duff" intact in the sentence you are editing.
Check whether the replacement sounds more formal, casual, emotional, technical, or forceful than the original word.
Read the full sentence after the swap. Keep the synonym only when the sentence becomes clearer or more precise.
Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
After choosing a replacement for "duff", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
If the synonym makes the sentence slower, vaguer, or more dramatic than intended, keep "duff" or choose a simpler alternative from the closest-match group.
OpenGloss and ConceptNet supply richer edges like generalizations, collocations, and derivations.
21 total sentences available.
She is up the duff.
Source: tatoeba (1545456)
She's up the duff.
Source: tatoeba (1559860)
Later on, all the tinned meat came to an end, likewise the potatoes, and we lived on salt meat, biscuit, and duff; this fare was served out to all the messes on board, and we, I was going to say, saloon-folk, fared no better than the fo'castle hands.
Source: wiktionary
The storekeeper had sent them an unbroken case of canned plum pudding, and probably by this time he was wondering what had become of that blanky case of duff.
Source: wiktionary
Showing 4 of 21 available sentences.
Closest matches include arse, bad, beat, behind, bilk.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.