In Japanese, the song "I’ve Been Working on the Railroad" begins with, "the railroad continues forever, over fields, mountains, and valleys."
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means go beyond, the verb vocab version is to go beyond.
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: to go beyond child (こ) years in order to become an adult, you have to be 18 years old in the USA, and 20 years old in Japan.