iron fist

bad iron

bad luck.

fist magnet

An annoying or angering individual; someone who compels others to assault them in rage.

hand over fist

Quickly or in great quantity, especially in reference to earning money.

iron eagle

An American military officer who has attained the rank of colonel but will not be promoted to the rank of general.

make a fist of

To do (something) reasonably successfully.

strike while the iron is hot

To act on an opportunity promptly while favorable conditions exist; to avoid waiting.