You might remember the meaning of the character 唤 with this easy mnemonic:
His mouth (口) is always open calling out for help. He needs help getting a magnet (⺈) off the fridge, flipping over a down box (冂), or help stuffing a big (大) burger into his mouth!
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.