dicky
"Dicky" is a casual British English word with a couple of useful meanings. It can describe something that is not working properly or feels unreliable, and it also has an older meaning as a noun referring to a type of clothing accessory. Here are the most common senses.
When something is 'dicky', it means it is weak, faulty, or not functioning as it should. Think of a car engine that keeps cutting out — you might say it has a dicky engine. It often describes health problems too, like a body part that keeps giving you trouble.
everyday language · Informal British English, still commonly used
A 'dicky' (also spelled 'dickey') is a detachable shirt front — basically a piece of fabric that looks like the front of a shirt but is not a full shirt. People used to wear these under a jacket so they appeared to be wearing a proper shirt without actually wearing one. You do not hear this meaning very often today.
clothing / fashion · Older usage, rarely used in modern speech