expression, ichidan verb
teach someone a lesson; show someone what one can do
Idiomatic expression used when someone intends to demonstrate their ability or superiority, often to put someone in their place or to prove a point. Can carry a confrontational or competitive tone.
今度こそ目に物見せてやる。
This time I'll show you what I can do.
彼はライバルに
He's eager to teach his rival a lesson.