频频
pínpín · HSK 7
again and again
🔁 频 = frequent; doubling it (频频) hammers home again and again, repeatedly
Chinese often doubles a character to intensify or stress repetition. 频 already means frequent, so 频频 (pínpín) stacks two frequents into again and again. The doubled sound pín-pín echoes the back-to-back rhythm of something recurring.