second hand

Từ điển WordNet v3.1 - WordNet Dictionary

I - noun

1. an intermediate person;
used in the phrase 'at second hand' (Freq. 1)
- he could learn at second hand from books
• Hypernyms:
mediator, go-between, intermediator, intermediary, intercessor
2. hand marking seconds on a timepiece
• Hypernyms:
hand
• Hyponyms:
sweep hand, sweep-second

II - adverb

from a source of previously owned goods
- I prefer to buy second hand
• Derived from adjective:
secondhand