驮
duò , tuó · HSK 7
to carry on one's back
🐴 驮 = 马 (horse) + 大 (big): a horse hauling a big load on its back
The horse radical 马 marks a pack animal; the 大 component beside it points to the heavy load it bears. Pronounced tuó (or duò for the load itself), it means to carry a burden on the back.
驮 — horse 马 + great 大
A semantic-phonetic compound: 马 (horse) gives the meaning, since the character refers to a horse or pack animal carrying a load on its back. 大 (great/big) serves as the phonetic component, hinting at the older pronunciation. The two readings duò and tuó distinguish the load itself from the act of carrying.