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hammer (something) home
To make something extremely clear; to make someone understand or realize something, especially through forceful repetition. (Can also be constructed as "hammer home (something).") John hammers their financial difficulties home whenever his wife suggests they buy something new. He needs to hammer home the fact that she was cleared of all charges before the election began.
hammer something home
Fig. to try extremely hard to make someone understand or realize something. The boss hopes to hammer the firm's poor financial position home to the staff. I tried to hammer home to Anne the fact that she would have to get a job.