crazy or extremely worried
сумасшедший или чрезвычайно обеспокоенный (sumasshedshiy ili chrezvychaino obespokoyennyy)
"You must be out of your mind to drive that fast!"
"Ты, должно быть, сошёл с ума, раз едешь так быстро!" (ty dolzhno byt soshyol s uma raz yedesh tak bistro)
the time in old age when a person starts behaving like a chi...
to cause problems or upset a stable situation
to stay close and support each other
to play an important part in something
to work hard on something for a long period
after a long time; in the end