This is the 13334th most frequent Russian word.
муштрой
The word "муштрой" does not exist in standard Russian; it may be a typo or misunderstanding.
Here, 'муштрой' refers to a form of extensive training or discipline, often in a military context.
Муштрой солдат он поднимал дисциплину в отряде.
Through drills, he raised the discipline in the unit.
In this context, 'муштрой' indicates a repetitive and rigorous practice purposed for training or improvement.
Для него муштра была средством достижения целеустремлённости.
For him, drill was a means of achieving determination.
Here, 'муштрой' denotes structured and consistent practice or adherence to rules.