sharpen

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sharpen /ˈʃɑɚpən/ verb
sharpens; sharpened; sharpening
sharpen
/ˈʃɑɚpən/
verb
sharpens; sharpened; sharpening
Learner's definition of SHARPEN
[+ object] : to make (something) sharp or sharper
[+ object] : to make (something) clearer or more distinct
[no object] : to become clearer or more distinct
[+ object] : to improve (something)
[no object] : to become more severe

sharpen up

[phrasal verb]
: to become better, smarter, more skillful, etc.
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