An onomatopoeic adverb indicating something happening gradually or steadily (often used as 'jiwari to').
薬を飲んだら、じわりと痛みが和らいできた。
After taking the medicine, the pain eased gradually.
その映画は公開後、口コミでじわりと人気が広がった。
That movie gradually gained popularity after its release through word of mouth.
値段がじわりと上がってきて、家計に影響が出始めた。
Prices have been creeping up slowly, and they have begun to affect household finances.