Secondhand means already owned by someone else before you bought it. A secondhand car, secondhand books, buy it secondhand.
It also means received from another person rather than witnessed — secondhand information is what somebody told you. Secondhand smoke is what other people's cigarettes give you, and it is a proven cause of disease in non-smokers.
1adjectivesecondhandAlready owned by someone else.
“She bought a secondhand bike for her son, as new ones were too expensive.”
secondhand is a quality of ownership.
Also accepted in games: used, second-hand
Second plus hand, from the idea of something passing through one owner's hands before reaching yours.
From second + hand.
Etymology from Wiktionary, CC BY-SA