きになる
mukini naru

Godan Verb (ru)
Expression

1. to become serious; to take something seriously (e.g. a joke, teasing); to become irritated or angry (esp. at something trivial); to get worked up

Usually Written in Kana
なんでもかんでもむきになってあくせくするのをやめれば、きっと人々 ひとびと いま ばい長生 ながいきするだろう。
nandemokandemo mukini natte akuseku suru nō yamereba kitto hitobitowa imano nibaimo nagaiki surudarō.
I'm sure people would live twice as long if they stopped getting themselves worked up over everything.
Other forms: