"Chop down" is a phrasal verb meaning to fell or cut down a tree or other large plant. Here are some examples of how to use it in a sentence:
- He chopped the tree down.
- She chopped down some thick grape vines.
- The lumberjack chopped down the giant redwood in minutes.
- We had to chop down the old oak tree because it was diseased.
- They chopped down the forest to build a new shopping mall.
- During the storm, several trees were chopped down by the wind.
The phrasal verb "chop down" implies a forceful action resulting in something being brought to the ground.