This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means express and the verb vocab version is transitive, meaning that it's done to something. So this verb means to express something or to show something.

Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:

You're struggling to express something to your friends: namely, that you are a walrus (あらわ). All your friends think you're a human, so they'll be shocked when you express to them the fact that, actually, you are a walrus. You need to get it off your chest though… Your big, blubbery walrus chest.