• НЕ ВСЕ ТО ЗОЛОТО, ЧТО БЛЕСТИТ
[saying]
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⇒ a person or thing may not be as good, valuable etc as he or it appears to be on the surface:
- all that glitters is not gold;
- all is not gold that glitters.
Большой русско-английский фразеологический словарь. — М.: ACT-ПРЕСС КНИГА. С.И. Лубенская. 2004.