noun
cartwright; wheelwright
Historical occupation: a craftsman who builds and repairs wooden carts and wheels. Rare in modern contexts.
江戸時代には、車大工が荷車を作っていた。
In the Edo period, cartwrights built freight carts.
大工 is a general carpenter or woodworker, while 車大工 specifically refers to a cartwright.
Compound of 車 (くるま, 'cart, wheel') and 大工 (だいく, 'carpenter'). The reading だいく becomes だいく due to rendaku.