a dolphin erected as a daybeacon or daymark: a navigational marker indicating the bounds of a water channel / allusion to 尽くし (tsukushi, “exhausting”)

(slang) weaksauce; weak

Synonym of モールス符号 (Mōrusu fugō, “Morse code”)

a chuck: a kind of clamp on a drill, lathe, or other spinning mechanical device that holds an object in place, such as a bit or other tool, or the object to be worked on