make a beeline for sb/sth

to "make a beeline for sb/sth" means "to move directly towards sb/sth"
(THis idiom refers to the way bees fly in a straight line when they return to the hive.)

eg. The children made a beeline for the food the moment they came in.

Don't bite the hand that feeds you

to " bite the hand that feeds you" means to be "unkind or disloyal to sb who has been kind or be helpful to you, or pays your wages."

Eg. When you say such nasty things about the organization, you're biting the hand that feeds you.

get on my nerves

To get on someone's nerves means to make someone annoyed or bad-tempered.
eg. That music gets on my nerves.

jack of all trades

"jack of all trades" means a person who can do many different kinds of work but who may not be very good at any one of them.

in for a penny, in for a pound 一不做，二不休

 "In for a penny, in for a pound" means if something has been started it should be finished, whatever the cost may be.

Strike while the iron's hot (打鐵趁熱，趁勝追擊)

"Strike while the iron is hot." (打鐵趁熱，趁勝追擊) means " to take action immediately in order to have a better chance of success."

Eg. You may not get a better offer - I'd strike while the iron's hot, if I were you.

When you have a customer on the phone, strike while the iron is hot by offering special discounts on certain items.

take as it comes

"take as it comes" means "to deal with something as it happens, and not plan for it."

Eg. At my age you can take every day as it comes and not try to guess about what will happen tomorrow.

Everyone has their cross to bear.

"Everyone has their cross to bear" means "an unpleasant situation or responsibility that you must accept because you cannot change it.

Eg. I hate my red hair and pale skin, but everyone has their cross to bear.
Someone has to look after mother and because I live the closest it's a cross I have to bear.