What does 司机 (sī jī) mean in English?

Card 207HSK 2010 Level 3207/299
CARD207
PROGRESS69%
司机
机機
sī jī
chauffeur; driver; CL:個|个[ge4]

Reveal: Click/Space/Enter/↑↓/w/s/j/kNavigate: ←→/h/l/a/d