Flection and Knife edge

Flection noun - The state of being flexed (as of a joint).

Knife edge and flection are semantically related In some cases you can use "Knife edge" instead a noun "Flection".

Knife edge noun - The sharp cutting side of the blade of a knife.

Flection and knife edge are semantically related in fold topic. Sometimes you can use "Flection" instead a noun phrase "Knife edge", if it concerns topics such as double thickness.