(literally) know the other side and yourself, a hundred battles will not be perilous

A true Tokyoite: one who was born and raised in the Japanese capital and whose parents are from Tokyo. One whose family has been from Tokyo for generations.

(calligraphy and typography) "Edo characters", distinctive calligraphic (and later, typographic) styles that were born in the Edo period

a tatami mat of the Edo (Tokyo) style

Edo River / Edogawa (one of 23 special wards in Tokyo prefecture, Japan) / a surname

(colloquial) current boyfriend

everything

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

everyone, one and all

to know through one's own experience