This is the 6315th most frequent Russian word.
уточнить
To clarify or specify.
Here, 'уточнить' is used in the sense of obtaining additional or precise information about the details of the meeting.
Мне нужно уточнить детали встречи.
I need to clarify the details of the meeting.
Here, 'уточните' (imperative form) is used to request a precise confirmation of information concerning the train schedule.
Пожалуйста, уточните, когда прибудет поезд.
Please specify when the train will arrive.
Here, 'уточнить' is used in the sense of making the understanding or explanation of the game rules more precise or accurate.