tremble, trembling, trembled, trembles, to shiver, shiver
Mnemonic
[du-] Dumbledore is in [1] front of the [-o] office building where he finds 多 many office workers outside taking a smoke break. They all are scared of him, so much so that their 口 mouths all 哆 tremble. Dumbledore, who is scared of muggles too, 哆 trembles as he runs down the parking lot, trying to get away from the stupid muggles and their 口 mouths which 哆 tremble.