С38

ВСЯК СВЕРЧОК ЗНАЙ СВОЙ ШЕСТОКЗНАЙ СВЕРЧОК СВОЙ ШЕСТОК (saying) do not overstep the limits of your authority (said to or about a person who is behaving in a way inappropriate to his position or is interfering in someone else's affairs): = stay on your own side of the fencethe cobbler should (let the cobbler) stick to his lastmind your own business.