pawn

noun

1.
an article deposited as security
Derived from:
pawn
2.
a person used by another to gain an end
cat's paw stale cat's-paw instrument
3.
(chess) the least powerful piece; moves only forward and captures only to the side; it can be promoted to a more powerful piece if it reaches the 8th rank
4.
borrowing and leaving an article as security for repayment of the loan
Derived from:
pawn