哆 almost never appears alone — its main job is in the disyllabic word 哆嗦 (duōsuo), 'to tremble; shiver from cold or fear'. The character is also used phonetically in transliterations: 哆啦A梦 (Doraemon), and as the solfège syllable 'do' (哆来咪 do-re-mi).
memory
口 (mouth) on the left + 多 (many) on the right — picture chattering teeth: a mouth that 'multiplies' its sound when shivering. The shivering meaning is reinforced by the doubled 多 → many small movements.
