noun
addressing; writing an address
Refers to the act of writing the recipient's name and address on an envelope, package, or similar item.
年賀状の宛名書きに時間がかかった。
Addressing the New Year's cards took a long time.
彼は宛名書きを間違えて、手紙が戻ってきた。
He made a mistake in addressing the envelope, and the letter was returned.
Compound of 宛名 (address) and 書き (writing), from 書く (to write).