TSUMUGU · TOCFL 1 · 字
妳
妳 ＝ 女 ＋ 尔
ㄋㄧˇ · nǐ
pron — you, said to a woman
字源 FORM — what the parts do
尔聲the classical you (爾), worn small
IFěr → nǐ — 妳 keeps the old n- that 爾 itself wore away
你 with the woman (女) written in: you, said to her. The split is young — last century, when writers wanted he, she, you and you-her each on the page; 尔 still carries 爾's old n-.
意 · Meanings
(本義)妳— you — to a woman常用
(本義) original meaning · → ⇒ each arrow = one more step of extension