Trang chủ/JLPT null/Từ vựng/コツコツコツコツ🔊☆ Lưu vào danh sáchコツコツNghĩa—Câu ví dụ彼はこつこつ事実を調べていた。He was patiently digging for facts.だれかがドアをこつこつとたたいている。Someone is tapping at the door.