To Cultivate
To Foster
transitive verb, godan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means cultivate and the verb vocab version means to cultivate.
You want to cultivate new friendships, so you decide to foster connection with two chicas (つちか), hoping to bring more people into your life. Now, no matter what you want to cultivate, you'll always have two chicas there to help you out.
高校時代のクラブ活動を通じて、友情を培うことの大切さについてたくさんのことを学びました。
I learned a lot about the importance of cultivating friendships through the club activities in high school.