double bass
US /ˌdʌb.əl ˈbeɪs/
UK /ˌdʌb.əl ˈbeɪs/
1.
the largest and lowest-pitched bowed string instrument in the modern symphony orchestra, with four or five strings and a range of about three and a half octaves
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She plays the double bass in the school orchestra.
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The deep resonance of the double bass filled the concert hall.