to sharpen is a form of:

Reconnoiter



verb
1.
(TRANSITIVE) (to make a reconnaissance (of), to examine, to make a preliminary survey) reconnoiter the en emy position ឈ្លបយកការណ៍ (នៃទីតាំងសត្រូវ ។ល។)
Example: To reconnoiter an enemy, sposition.reconnoiter the terrain ពិនិត្យមើល
2.
(INTRANSITIVE) ឈ្លបយកការណ៍