noun
fluorescent lamp; fluorescent light
Standard term for a fluorescent light fixture or tube.
オフィスの蛍光灯が切れたので交換した。
The fluorescent light in the office burned out, so I replaced it.
noun
slow person; someone slow on the uptake
Dated slang comparing a person's slow reaction to the flickering or delayed start of old fluorescent lights.
彼は冗談の意味がわからなくて、まるで蛍光灯みたいだ。
He doesn't get the joke; he's like a fluorescent light (slow to react).