You might remember the meaning of the character 歉 with this easy mnemonic:
Apologize right now for making fun of my dog's eyebrows (丷) and snout (彐)! I think you have grains (禾) of rice in your brain so you lack (欠) common knowledge and decency!
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.