Look (one) up and down phrase
To openly and carefully look at or examine someone from head to foot and such that makes one annoyed.
After looking me up and down, the examiner told me to get in and take the right seat according to my number.
Having looked the little girl up and down again, I didn't believe she is a university student.
To explore or investigate every possible means
Used to describe the act of scrutinizing something thoroughly.
To examine someone carefully and thoroughly to see if they are worthy
Used to indicate an inspection of a person's buttocks for something concealed there, often drugs
1. Used when one tries to find out more about something which has been mentioned.
2. Used when one adds something for what he have already done so as to ensure to achieve your aim.
3. Used when checking one's health who has received medical treatment to know whether it is effective or not.
The verb "look" must be conjugated according to its tense.
The origin of this phrase is not clear.