Definition of "knife-edged" []

• Edged like a knife; tapering to a thin edge: specifically applied in entomology to a compressed abdomen when it presents a sharp edge on the ventral surface, as in certain Cynipidæ.

The Century Dictionary (Public Domain)

• "The angel flexed his silver wings, the knife-edged feathers gleaming."
• "There have been tart knife-edged satires like Dr. Strangelove and weepy but powerful melodramas like On the Beach."
• "When the soldiers reached the knife-edged passage, he was prompted to warn them."