doublebass
nounUK /ˌdʌbəlˈbeɪs/
US /ˌdʌbəlˈbeɪs/
A double bass is a very big string instrument that makes low sounds.
She plays the double bass in the school orchestra.
OTHER MEANINGS
2. The lowest-pitched member of the violin family, played standing or sitting.
The double bass anchored the rhythm of the jazz band.
3. A large bass drum in some musical traditions.
The drummer struck the double bass to mark the beat.
4. A deep male singing voice, or a singer with such a voice.
He sang the double bass part in the choir.