This is the 17189th most frequent Russian word.
стоп
"Stop" - a command to cease movement or action; also used as "halt."
This usage of 'стоп' is an imperative form used to command someone to halt their action.
Стоп, что ты делаешь?
Stop, what are you doing?
Here, 'стоп' is used colloquially to indicate a full quantity or a grouping, such as a week's amount.
Мы взяли стоп продуктов на неделю.
We took a week's worth of provisions.
In this case, 'стоп' appears as part of the word 'стопка', meaning 'stack' or 'pile', showing the word's root used within another term.