the nail that sticks out gets hammered down

another nail in someone's coffin

An event that increases the likelihood of or causes further failure.

as it gets

As it is possible to be.

final nail in the coffin

Something that is ultimately responsible for a previously prospective demise or failure.

give as good as one gets

To behave toward others in a manner resembling or commensurate with their behavior towards oneself, especially in a situation where one is insulted or otherwise ill-treated.

hit the nail on the head

To identify something exactly; to arrive at exactly the right answer.

last nail in the coffin

Alternative form of final nail in the coffin.

nail down

to make something (e.g. a decision or plan) firm or certain

nail the hammer on the head

Nonstandard form of hit the nail on the head.