DICT.TW Dictionary Taiwan

 through thick and thin
 赴湯蹈火,不避艱險,不論禍福

 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.]
    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.