KanjiJLPT N2
Apologize

apologize, thank, refuse

Mnemonic

Words of regret spill from your mouth as you apologize to somebody you wronged. They pull out a measurement tape to gauge how deep your bow goes—only if the measurement is low enough will somebody accept your words and forgive you.
Additional thoughts
Picture someone bowing deeply while apologizing, with another person literally measuring the angle of the bow with a tape measure. The deeper the bow, the more sincere the words.
Quick recall
Your words beg somebody to forgive, and the measurement of your bow proves you truly apologize.

Details

The keyword for 謝 is apologize. This kanji conveys the act of expressing regret or asking for forgiveness for a wrongdoing or offense. It carries the sense of humbly acknowledging one's fault and seeking to make amends. Beyond apology, the character can also extend to meanings of gratitude and thanking, as both actions involve a sincere expression of feeling directed toward another person.
On'yomi
しゃ
Kun'yomi
あやま.る