This is not a common saying. That being said, the author is saying his heart 'fluttered' or beat eradically by using 'turning' instead of the usual description. (Likely to sound original), in other words; she makes him feel anxious.
31 Ocak 2015
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Hâlâ cevap bulamadın mı?
Sorularını yaz ve ana dil konuşanlar sana yardım etsin!