\ ˈsəb+ˌ-\
plural sub-basses

Definition of sub-bass

1 Sub-bass, Sub-basses : an organ pedal stop of 32′ pitch or 16′ pitch
2 : a range of low frequencies extending from approximately the lower limit of the bass voice to the lower limit of human hearing also : sound in this frequency range The music wasn’t audible through the din, but she felt the sub-bass throbbing through the floor.

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History and Etymology for sub-bass

sub- + bass

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to gather or build up little by little

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