Meaning

• 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, for a servant.

• A seat in a carriage, for the driver.

• The luggage storage compartment of a sedan/saloon style car.

  "Can you open the dicky for me?"

• A leather apron for a gig, etc.

• A small bird; a dicky-bird.

• (in negative constructions) An insignificant sound or thing; dicky-bird.

• A pilot.

• A hedge sparrow.

• A donkey.

• A haddock.

Meaning

• Doubtful, troublesome; in poor condition

  "He had a dicky heart."