Nail :
see: an opponent, that cannot be ignored
a rusty nail: no plans to implement
to hammer: serious harm caused by the conduct of an opponent
sell nails: you will perform a job that does not enjoy the respect
to hammer a lot of nails: a lot of work ahead of you, be patient, and your effort will not be wasted
try to hammer the nail and bend it: you will render your enemy harmless
the final nail in the coffin: happiness
be injured by the nail: a bad investment
see the body pierced by a nail: someone will make you pain; suffering