If your heart wears thin I will hold you up. And I will hide you when it gets too much.
This is from a song. I couldn’t really find a definition of heart wears thin.
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1It means losing confidence, strength, or the will to carry on, as the context shows: If your heart wears thin / I will hold you up / And I will hide you / when it gets too much / I will stay beside you / Nobody will break you. – Weather Vane Dec 2 '17 at 16:13
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The idiomatic expression is wear thin:
- Be weakened or diminished gradually, as in My patience is wearing thin. [Late 1800s].
- Become less convincing, acceptable, or popular, as in His excuses are wearing thin. [First half of 1990s]
Both usages transfer the thinning of a physical object, such as cloth, to nonmaterial characteristics.
(AHD)
In your sentence heart means courgage, and wearing thin means “lose heart.”
