loyal through thick and thin
Perseverance, a Chinese idiom, pronounced Ji āēē Nb ù y ú, means to stick to the moral integrity and never change. From peony.
Analysis of Idioms
Steadfast and consistent
The origin of Idioms
Xu Chi's peony: "they are indomitable and unswerving. No test can shake them."
Idiom usage
Complement; as predicate and attribute; with commendatory meaning
loyal through thick and thin