Трещина в горшке скоро скажется

Once friendly relations are impaired, you cannot restore them. See Порванную веревку как ни вяжи, а все узел будет

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Cf: A broken egg cannot be put back together (Am.). A broken friendship may be soldered, but will never be sound (Am.). Broken friendships may be soldered, but never sound (Br.). A cracked bell can never sound well (Am., Br.). A cracked bell is never sound (Br.)