Idioms part 1

come of age

legally become an adult

time and again

repeatedly

be up against something

to be having or likely to have serious problems or difficulties

add insult to injury / rub salt in the wound

cыпать соль на рану

not know someone from Adam

to have never met someone and not know anything about them

act the fool

to behave in a silly way, often intentionally to make people laugh:

get one’s act together

объединить наши усилия

over and above

in addition to

above board

If a plan or business agreement is above board, it is honest and not trying to deceive anyone

get above oneself

think one is better than one actually is

be above one’s head

something is too difficult, complex, or advanced for someone to understand or handle