卧薪尝胆

lit. to sleep on brushwood and taste gall (like King Gou Jian of Yue 勾踐|勾践[Gou1 Jian4]), in order to recall one's humiliations) (idiom) / fig. to maintain one's resolve for revenge

lit. to lie on firewood and taste gall (idiom); fig. suffering patiently, but firmly resolved on revenge

to lie / to crouch

fuel / salary

to taste; to try (food) / to experience / (literary) ever; once

to taste; to experience (variant of 嘗|尝[chang2])

old variant of 嘗|尝[chang2]

gall bladder / courage / guts / gall / inner container (e.g. bladder of a football, inner container of a thermos)