expression, ichidan verb
rank; discriminate between; put one above the other
Used when comparing two or more things and assigning a relative order of superiority or inferiority. Often implies a judgment of quality or value.
この二つの案に優劣をつけるのは難しい。
It's difficult to rank these two proposals.
彼はいつも人に優劣
He has a habit of always discriminating between people.