To Criticize
する verb
批判 is criticism so the verb version of that would be to criticize.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It will be much easier to read this if you know 批判, as well.
私の彼は、私を批判すると、いつも後でアメをくれる。
My boyfriend always gives me a hard candy after criticizing me.
みんなは口をそろえて男のことを批判した。
Everyone said the same thing and criticized the man.
お前って、他人の批判してばっかりだよな。
You're always finding fault with other people, aren't you?