Knife edge and Lapel

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

Lapel and knife edge are semantically related. in fold topic. In some cases you can use "Lapel" instead a noun phrase "Knife edge", when it comes to topics like double thickness.

Lapel noun - Lap at the front of a coat; continuation of the coat collar.

Knife edge and lapel are semantically related. Sometimes you can use "Knife edge" instead a noun "Lapel".