Meaning of hammer in

1. The construction worker used a hammer to hammer in the nails.
2. I had to hammer in the stakes to secure the tent in place.
3. The instructor demonstrated how to properly hammer in the golf tee.
4. Make sure to hammer in the signpost firmly so it doesn't fall over.
5. The blacksmith used a heavy hammer to hammer in the red-hot iron.
6. The carpenter had to hammer in the dowels to assemble the bookshelf.
7. It took a lot of effort to hammer in the wooden pegs into the hard ground.
8. The farmer used a mallet to hammer in the fence posts around the pasture.
9. The music teacher instructed the students to carefully hammer in the piano keys.
10. I had to hammer in the cork to seal the bottle of wine.