Sino-Korean vocabulary or "Hanja-eo"

The iteration mark 々, which indicates that the previous kanji ought to be repeated.

Alternative spelling of 漢字返し

smaller kanji historically used as a pronunciation guide, similar to modern furigana

(education) The 1,026 kanji taught in primary school; a subset of 常用漢字 (じょうようかんじ, jōyō kanji)

(orthography, historical) tōyō kanji (kanji that were declared official by the Ministry of Education of Japan on November 16, 1946, later replaced by 常用漢字 (jōyō kanji))

joke around, goof around / (offensive) bullshit

a kanji radical at left which is the same as the kanji for tooth, namely 歯

Alternative form of 歹偏

the left-side "death" radical (歹), e.g. 死