With accent marks:
Где то́нко, там и рвётся.
Where it is thin, it breaks.
Everything that is in a poor, unsustainable, neglected state becomes a cause of great misfortune, problem, disaster. New troubles begin exactly where it was already bad before.
The same idea is expressed in other languages by many peoples of the world.
The closest English equivalents of this Russian proverb are:
- The chain is no stronger than its weakest link.
- The worst spoke in a cart breaks first.
Other Russian proverbs
Hurry to much and you will make people laugh.
Don't go to the woods if afraid of wolves.
Poor people are inventive.
Better to see once than hear a hundred times.
Do not look at a given horse's teeth.
The morning is wiser than the evening.
A bad example is contagious.
Fear has big eyes.