Expressions (phrases, clauses, etc.), Godan verb with 'ru' ending
to compete ruthlessly; to sharpen swords
Idiomatic expression
ハーツ社とエイビィス社はカーレンタルの業界でしのぎを削っている。Hertz and Avis are head to head competitors in the car rental business.
Also written 鎬を削る【しのぎをけずる】