“to gather / to collect” in Japanese is 集, read shuu, atsu (しゅう, あつ). It is a Grade 3 Kyōiku kanji, taught in year 3 of Japanese elementary school, and appears in words such as 集める (to collect).
What does 集 mean?
切手を集める。
Same sound, different character — the classic trap. Compare them side by side: