足るを知る者は富む

たるをしるものはとむ

content is the philosopher's stone, that turns all it touches into gold

恥を知る

はじをしる

to know shame, to have a sense of shame, to be ashamed

男を知る

おとこをしる

to lose one's virginity (of a woman); to become sexually active

天知る地知る我知る人知る

てんしるちしるわれしるひとしる

murder will out; truth will out; bad deeds will always be discovered; heaven will know, earth will know, I will know, people will know

天知る地知る我知る子知る

てんしるちしるわれしるししる

murder will out; truth will out; bad deeds will always be discovered; heaven will know, earth will know, I will know, you will know

知る

しる

to be aware of, to know, to be conscious of, to cognize, to cognise

足る

たる

to be sufficient, to be enough, to be worthy of

知恵を絞る

ちえをしぼる

to rack one's brain

情けを知る

なさけをしる

to fall in love (for the first time), to know love

天命を知る

てんめいをしる

to turn 50, to reach 50 years of age

足を止める

あしをとめる

to stop walking; to pause

足元を見る

あしもとをみる

to take advantage (e.g. of a weak situation), to size up (e.g. customer when setting a high price), from palanquin bearers gauging how weary a traveler's feet are, and raising the price accordingly

足を向ける

あしをむける

to head towards; to direct one's steps to

足を速める

あしをはやめる

to quicken one's pace (steps)

知る人ぞ知る

しるひとぞしる

well-known only to those in the know, be well-known but to the few, highly regarded by a select few

衣食足りて礼節を知る

いしょくたりてれいせつをしる

the poor can't afford manners, only when basic needs for living are met can people spare the effort to be polite

女の味を知る

おんなのあじをしる

to have carnal knowledge (of a woman)

知識を広める

ちしきをひろめる

to extend one's knowledge

知識を蓄える

ちしきをたくわえる

to gain knowledge, to build up one's knowledge