Question

what is the silent consonant in knees​

Answer 1

Explanation:

Words like knowledge, knee, knife have their origin associated to Old English forms. These forms used to begin with cn (the change from c to k was an orthographic change, which is out of the current question's scope). So, these words beginning with 'k' were pronounced with sound of k followed by 'n'.

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Answer 2

'K' is Silent in the word knees.