• 当あたる — to hit, to be correct
• 当あてる — to apply, to guess
• 担当たんとう — in charge of
• 当然とうぜん — obvious, natural
• 当日とうじつ — the day (of the event)
• 見当けんとう — estimate, guess
• 妥当だとう — appropriate / reasonable
• 本当ほんとう — truth / real
• 当番とうばん — being on duty / person on duty

This kanji originally represented a person aligned with a mark — like hitting the target. It often appears in expressions related to correctness, assignment, or judgment.

鈴木すずきさんが当選とうせんしました。
Mr. Suzuki was elected.

彼かれは くじ引びきに当あたりました。
He won the lottery.