You’d never guess that the most complicated word in English is a three-letter word.

According to this article in Reader’s Digest, Oxford English Dictionary editors discovered that the verb form alone has 645 different meanings.

Here are some examples of run (as a verb):

We run a fever.
We run a bath.
We run our fingers through our hair.
We run across the road.
Our noses run.
We run up bills.
We run water into a basin.
Our cars won’t run.
Buses run every twenty minutes.
Things run according to plan.

And examples of run (as a noun):

In cricket, you score runs.
We went out for a run.
You might have a run of bad luck.

If you’re interested in more examples, take a look here (link to: https://en.oxforddictionaries.com).