Someone who is old fashioned. The phrase can directly refer to old fashion too.
Hackneyed, cliched or worn out.
Ask that old hat to keep out of my business. She has a lot to correct in her own life first.
He maybe an old hat but knows so much about his trade that is sure to surprise you.
The grocer is an old hat, he will not give you a single penny of discount.
I am not sure why people think grandpa is an old hat, he has many fascinating ideas.
The dress that my mother wore for her wedding is an old hat now but it looked fantastic back in the day.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.