a heart, mind, core / a spirit, vitality / inner strength, marrow / 心, 芯: the core (for example, of a fruit) / 心, 芯: a wick / (Buddhism) citta: the ego or spirit / (Buddhism) Short for 心王 (shinnō):

Short for 心臓 (shinzō): heart as an organ in the body / Short for 心頭 (shintō): heart, mind, spirit / Short for 中心 (chūshin): center, middle

(colloquial) current boyfriend

everything

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)

everyone, one and all

気を付ける: to be careful, to watch out; to take care

to light a fire / to set on fire; to ignite; to set fire to / (figuratively) to spark; to ignite (excitement, debate, controversy, etc.)

Misspelling of きをつけて. Since o is written as を when used as a particle.

to find fault