To persist in a difficult situation; to endure or persevere during challenging times.

कठिन परिस्थितियों में धैर्य बनाए रखना

English Usage: When things get tough, just hang on in there and everything will be okay.

Hindi Usage: जब चीज़ें कठिन हो जाएँ, तो बस डटे रहना और सब ठीक हो जाएगा।