You might remember the meaning of the character 胸 with this easy mnemonic:
As a Valentine's day gift, I will draw a moon (月) on my chest and wrap (勹) myself in an open box (凵). My boyfriend is going to be so surprised when he slashes (丿) the box open!
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.