entries → 來信
TSUMUGU · TOCFL B2 (est.) · 詞
來信 word · TOCFL B2 (est.)
來信 ＝ 來 ＋ 信
ㄌㄞˊ ㄒㄧㄣˋ · láixìn
noun — an incoming letter, a letter received; verb — to write in, to send a letter

字源 FORM — what the parts do

來to come, incoming (來到)lái
信a letter (信件)xìn
來信，來到的來，信件的信。
關 · Related
回信huíxìnto write back — the reply to a 來信信件xìnjiànmail, correspondence — the same 信