adverb, adverb taking the 'to' particle
moment by moment; hour by hour; with each passing moment
Describes a situation that changes or progresses continuously, often with a sense of urgency or steady advance. Commonly used with verbs of change, approach, or deterioration.
台風が刻々と近づいている。
The typhoon is approaching moment by moment.
状況は刻
The situation is changing with each passing moment.