Since this word has okurigana (hiragana attached to the kanji) you know that it's probably going to be the kun'yomi reading. You haven't learned this reading yet so here's a mnemonic to help you:
You don't fit inside your bed anymore. I guess you've grown? Better get out the trusty old saws (おさ) and chop off your footboard.
Did the one hundred million yen fit inside the suitcase?
After eating the ice cream, my emotions started to settle down.
We wanted to eat all five large pizzas, but they couldn't be finished within the all-you-can-eat time limit.