大大 (dà dà) means “greatly; enormously; (dialect) dad; uncle”. It is an HSK 2 Chinese word in the HSK 3.0 vocabulary.
Practice each character:
这大大提高了工作效率。
Zhè dàdà tígāo le gōngzuò xiàolǜ.
This greatly improved work efficiency.
Updated: 2026-07-18