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The Collaborative International Dictionary
Thick-and-thin block

Thick \Thick\, n.

  1. The thickest part, or the time when anything is thickest.

    In the thick of the dust and smoke.
    --Knolles.

  2. A thicket; as, gloomy thicks. [Obs.]
    --Drayton.

    Through the thick they heard one rudely rush.
    --Spenser.

    He through a little window cast his sight Through thick of bars, that gave a scanty light.
    --Dryden.

    Thick-and-thin block (Naut.), a fiddle block. See under Fiddle.

    Through thick and thin, through all obstacles and difficulties, both great and small.

    Through thick and thin she followed him.
    --Hudibras.

    He became the panegyrist, through thick and thin, of a military frenzy.
    --Coleridge.

Wiktionary
thick-and-thin block

n. (context nautical English) A fiddle block.