Meaning: じゃっこうn. (Kanji=弱行) weakness in executionn. (Alt=しゃっく,しゃっこう,せきぐち,じゃっく, Kanji=赤口) Shakku, Shakko, Sekiguchi, Jakku, Jakko, one of the 6 days of the rokuyo Japanese calendar (signifies "unlucky and bad luck all day except at noon from 11:00 A.M. and 1:00 P.M.")