dicky

A diminutive of the male given name Richard.

A louse.

Dicky dirt = a shirt, meaning a shirt with a collar.

A detachable shirt front, collar or bib.

A hat, especially (in the US) a stiff hat or derby, and (in the UK) a straw hat.

A seat behind a carriage or early motor car, for a servant.

...and she was just in time to see Mr. Boyne Sillery hand her aunt into a carriage, jump in himself, when it drove off with a rapidity which scarcely allowed her to observe that a large imperial was on the top, and her aunt's servant, with a huge bandbox, on the dickey.

In bad condition; weak, faulty, unreliable, doubtful, troublesome.

He had a dicky heart.

I've got a dicky tummy.