What is the significance of having a silent letter like “k” in a word? [duplicate]

Why is the k silent in: known /nəʊn/; knife /nʌɪf/, and knight /nʌɪt/?

What does this specify?And what is k doing there if there is no need to pronounce it?

Answer

That silent k, at one point in the history of English, didn’t used to be silent. Anglo-Saxon (Old English) did in fact pronounce the k. A trait that still exists in most other modern Germanic languages, i.e. Dutch, Frisian, Danish, German etc. However, somewhere down the road in the evolution of English, the k sound had for some reason dropped but the spelling had petrified. Long story short, it’s significance is historical rather than practical.

Attribution
Source : Link , Question Author : mschaudhari , Answer Author : TCYK

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