Please assemble the people wearing blue shirts.
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I am collecting pictures of foreign food.
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 collect so the vocab verb version means to collect.
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:
When you only have one thing, there's only one thing. Nothing is collected. But when you have two... "ah two!" (あつ). Now you're starting to collect things.