bass guitar
US /ˌbeɪs ɡɪˈtɑːr/
UK /ˌbeɪs ɡɪˈtɑːr/

1.
guitare basse
a stringed musical instrument, similar in appearance to an electric guitar but with a longer neck and typically four thicker strings, producing lower-pitched sounds
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He plays the bass guitar in a rock band.
Il joue de la guitare basse dans un groupe de rock.
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The rhythm section, with drums and bass guitar, laid down a solid groove.
La section rythmique, avec la batterie et la guitare basse, a posé un groove solide.