Definition of niff in English:

niff

noun

British
informal
  • An unpleasant smell.

    ‘the horrible fishy niff’
    • ‘Council environment chiefs have launched an investigation into the source of the nasty niff.’
    • ‘The nasty niff was so bad that a stewardess asked her to put them back on.’
    • ‘After several weeks I started to notice a nasty niff on my clothes and realised the cream was to blame.’
    • ‘Top Tip: a few drops of tea tree oil in the bottom prevents nasty niffs.’
    • ‘Councillors are calling on the Government to get involved in ending a nasty niff pervading Castle Point.’
    smell, scent, aroma, perfume, fragrance, bouquet, savour, nose, tang, essence, redolence
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verb

[NO OBJECT]British
informal
  • Have an unpleasant smell.

    ‘a dark room that always niffed a bit’
    • ‘Instead of niffing of pongy feet, the new hi-tech trainers could smell of lemons or even wild flowers.’
    • ‘Note, this part after the niffing has not been documented by any of the expert folks as yet for us newbies.’
    foul-smelling, evil-smelling, stinking, stinking to high heaven, reeking, fetid, malodorous, pungent, acrid, rank, putrid, noxious
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Origin

Early 20th century (originally dialect): perhaps from sniff.

Pronunciation

niff

/nɪf/