2 occurrences

'Sharpen' in the Bible

You shall whet and sharpen them so as to make them penetrate, and teach and impress them diligently upon the [minds and] hearts of your children, and shall talk of them when you sit in your house and when you walk by the way, and when you lie down and when you rise up.

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Strong's
Root Form
Definition
Usage
חדד 
Chadad 
Usage: 6

לטשׁ 
Latash 
Usage: 5

שׁנן 
Shanan 
Usage: 9