落手 らくしゅ
rakushu

Noun
Suru Verb

1. receiving (e.g. a letter); coming to hand; acknowledging receipt

Transitive
Formal Register
手紙 てがみ落手 らくしゅいたしました。
otegamirakushu itashimashita.
I am in receipt of your letter.
Noun

2. bad move; missed move

Shogi
Go