Thing
Matter, Action
noun
The kanji and the word are exactly the same. That means they share meanings as well. Additionally on top of thing there are the meanings matter and action as well. Like the kanji, this word has to do with action things... things that you do, for example, rather than physical things.
Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word:
It's hard to start a mnemonic with the word "thing" or "action," so let's continue off the kanji mnemonic where you've put a cross in the mouth of a wolverine. Why did you do it? You knew that feisty wolverine was going to eat your coat (こと).
やる事
thing to do
する事
thing to do
食べる事
eating
その事については、後でまたゆっくり話しませんか。
Shall we talk about the matter later?
先生が言ってる事は半分しか分かりませんでした。
I only understood half of what the teacher was saying.
車で会社に行く事が歩いて行く事よりも多いです。
I go to work by car more often than I walk.