“to forget” in Japanese is 忘, read bou, wasu (ぼう, わす). It is a Grade 6 Kyōiku kanji, taught in year 6 of Japanese elementary school, and appears in words such as 忘年会 (year-end party).
What does 忘 mean?
かさを忘れた。
Same sound, different character — the classic trap. Compare them side by side: