To Fit Inside
To Settle Down, To Be Finished
intransitive verb, godan verb
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb.
If you obtain something, you'll want it to fit inside your bag. Otherwise how can you take it home? Depending on the context, this verb can also mean to settle down and to be finished.
Like most verbs with まる as okurigana, this is an intransitive verb. That means it happens by itself, with no emphasis on the person or thing that's making something fit inside, or settle down.
おさまる
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.
一億円、そのスーツケースに収まった？
Did the one hundred million yen fit inside the suitcase?
アイスを食べたら、感情が収まってきたんだよね。
After eating the ice cream, my emotions started to settle down.
皆で大きいピザを五枚食べきりたかったが、食べ放題の時間内に収まらなかった。
We wanted to eat all five large pizzas, but they couldn't be finished within the all-you-can-eat time limit.