To Foster, To Raise, To Develop, To Cultivate
transitive verb, godan verb
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means foster so the verb vocab version is to foster or to raise. This can also refer to fostering a skill or ability, so can also mean to develop or to cultivate.
やしなう
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: You're offering to raise some girl as your own. After the paperwork is over, you can finally say: "Yah, she now (やしな) is my kid!"
家族を養うにはお金がかかります。
It takes money to raise a family.
ワニカニがトーフグを養っているの？それともトーフグがワニカニを養っているの？
Does WaniKani foster Tofugu or does Tofugu foster WaniKani?
うちの学校では、考える力を養う教育に力を入れています。
At our school, we focus on education that nurtures critical thinking skills.