You might remember the meaning of the character 拦 with this easy mnemonic:
These umbrellas (扌) should hinder anyone who tries to break into our house. Oh, don't raise your eyebrows (丷) at me! You'll think it's a good idea after we fend off one (一) or two (二) criminals.
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.