thick and thin noun2 •Both thickets and thin woodland; all obstacles in a path (including bad weather).His tyreling Jade he fiersly forth did push / Through thicke and thin, both over banck and bush [...] — 1590 •Both good and bad times.As Joan of France, or English Mall, / Through perils both of Wind and Limb, / Through thick and thin she follow'd him, / In ev'ry Adventure h' undertook, / And never him, or it forsook. — 1662
