No More Than
Or Less
noun
Start from something and then go below it. Now you have "no more than ___," or, in other words, "___ or less!"
When used with numbers, 以下 always includes the number itself, like 十人以下 (ten or fewer people). In non-numerical contexts, it can mean "less than" in a looser sense, like お前は犬以下だ (You're less than a dog).
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
半分以下
half or less
高校生以下
high schoolers and below
中学生以下
middle schoolers and below
五千円以下の中古のテレビはありますか？
Is there a used TV for 5,000 yen or under?
一メートル以下のイカは小さいイカです。
Squid a meter or less in length are small squid.
12才以下だとタダらしいよ！
I heard it's free if you're twelve or younger!
まさかこれ以下のレベルのクオリティの作品があるとは…ビックリです。
To think there's a work with a lower level of quality than this one… I'm shocked.