Definition of out-sharpen in US English:

out-sharpen

verb

rare
  • with object To exceed in sharpness; to sharpen (an object) better than.

Origin

Mid 19th century; earliest use found in Charles Dickens (1812–1870), novelist. From out- + sharpen.

Pronunciation

out-sharpen

/ˌaʊtˈʃɑːp(ə)n/