2.I'd better = I should I'd better go buy some food behore the store closes.
3.can't make it=can not attend I can't make it to a soccer match. I have already made other plans. I can make it tomorrow. Can you make it tomorrow? / next week? No. I'm not sure if I can make it. Yes. I can make it next week. I'm free. (あいている)
4.cheesy 人に対しては使わない Your joke is cheesy.
5.chill/chill out =calm down 若い人がよく使う。 Chill out! We'll get there on time!
6.couldn't care less 別に。どうでもいい。
7.It doesn't matter. I don't maind. I don't care
8.You are wellcom.
9.Down-to-earth 腰が低い人。良い意味で使う。 Frank is a very friendly,down-ton-earth person.
10.Life in Niigata is laid back. Niigata is laid back place. Niigata is more laid back place than Tokyo. Frank is an easy-going person. Our manager is an easy-going person. 良い意味 She never gets angry. happy-go-lucky person 8割は侮蔑。よくない意味