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the above transcription of strengthen 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 strengthen in a speech by a native speaker of british english:
“… so what is this strengthen this is the …”
Strengthen means to make stronger.
the word strengthen occurs in english on average 12 times per one million words; this frequency warrants it to be in the study list for C1 level of language mastery according to CEFR, the Common European Framework of Reference.