to set a firm boundary or make a limit clear
установить четкую границу или ясно обозначить предел (ustanovit' chetkuyu granitsu ili yasno oboznachit' predel)
"The prime minister drew a line in the sand regarding national security."
"Премьер-министр провел черту в песке по вопросам национальной безопасности." (Prem'er-ministr provel chertu v peske po voprosam natsional'noy bezopasnosti.)
to wait for something to improve or happen
to admit or confess responsibility for something
Always remain optimistic and determined.
To stay calm and steady, especially during difficulties.
to make a silly or careless mistake
to feel mentally or emotionally unstable