think over

- подумать хорошенько; размышлять.
Example:
When Charles asked Betty to marry him, she asked him for time to think it over.


do time

- сидеть в тюрьме.
Example:
He was doing time when I first heard about him.


feel ill at ease with

- чувствовать себя не в своей тарелке.
Example:
I always feel ill at ease with boss, I can't say why.