壮大 zhuàngdà to expand
to expand; to strengthen
How to remember 壮大: 壮 big + 大 big = to expand.
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How it is used
- To grow stronger / expand - 队伍壮大 (duìwu zhuàngdà) the ranks swell; 发展壮大 (fāzhǎn zhuàngdà) develop and grow strong.
- About an organization or force expanding in size and strength. Formal-leaning.