To Judge
To Conclude
する verb
判断 is judgement. Make that into a verb and you have to judge, or to conclude.
はんだんする
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 help to know 判断 before learning this, but if you don't I won't judge you (the Crabigator will).
よく人を見た目で判断してはいけないと言います。
People often say that you shouldn't judge a person by their looks.
聞いたことから判断すると、真打ちは最後にあるようだね。
Judging from what I’ve heard, the best seems to have been saved for last.
食用キノコか毒キノコかを判断するのは難しい。
It is difficult to judge whether a mushroom is edible or poisonous.