賑わう
にぎわう · nigiwau · JLPT N1 · verb-godan
to be crowded with people
🏮 賑 = wealth (貝 money radical): rich towns flourish and fill with crowds
The 貝 radical originally meant shells used as money. Prosperous, wealthy places draw crowds, so 賑わう covers both flourishing and being crowded with people.