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the above transcription of stiffen is a detailed (narrow) transcription according to the rules of the International Phonetic Association; you can find a description of each symbol by clicking the phoneme buttons in the secction below.
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An example use of stiffen in a speech by a native speaker of american english:
“… uh can stiffen the polymer and so it can …”
the word stiffen occurs in english on average 0.3 times per one million words; this frequency warrants it to be in the study list for C2+ level of language mastery according to CEFR, the Common European Framework of Reference.