动人心弦 [- - - xián]strike [touch] a deep chord (in the heart of sb.); be deeply moving; rouse one's tender emotions; stir up one's inmost feelings; touch one's feeling; tug at one's heartstrings：
•¶ 她的演奏动人心弦， 全场观众赞叹不己。 Deeply moved by her performance, the whole audience gasped with admiration.