hammer into

hammer (something) into (someone or something)

1. To strike something repeatedly, as with a hammer, until it penetrates some surface or thing. Next, you need to hammer these nails into the wall.
2. To commit some piece of information into one's or someone else's long-term memory, especially through intense repetition. How many times do I have to hammer it into your head? Do not drive my car unless I give you permission first! I've just been trying to hammer these formulas into my head for the big test tomorrow!
See also: hammer
Farlex Dictionary of Idioms.

hammer something into something

 and pound something into something
hammer something in; pound something in Lit. to drive something into something as with a hammer. Todd hammered the spike into the beam. He hammered in the spike. He hammered it in with two hard blows.
See also: hammer
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

hammer into

v.
1. To drive something through some surface by striking it with a hammer: The carpenter hammered a nail into the board.
2. To teach or inculcate something to someone by constant, intense repetition: The teacher hammered the multiplication tables into the pupils.
See also: hammer
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • hammer (something) into (someone or something)
  • hammer into and pound into
  • pound (something) into (someone or something)
  • hammer onto
  • hammer (something) onto (something)
  • hammer down
  • come under the hammer
  • come/go under the hammer
  • go under the hammer
  • go at (one) hammer and tongs