Vocabulary
하나하나
one by one; each and every
Meaning
하나하나 — one by one; each and every
Why this form?
하나씩 — one at a time : stresses sequence or distribution; 하나하나 means “each and every one individually,” often with careful attention.
Forms not to confuse
하나씩
질문을 하나씩 해 주세요. — Please ask the questions one at a time.
Examples
나쁜 기억 하나하나에 맞서는, 소중한 좋은 기억도 분명히 있어요! — For every bad memory, there must also be a precious good memory to counter it!
문제를 하나하나 해결했어요. — I solved the problems one by one.