List as long as (one's) arm Proper Noun spoken language informal
To refer to a very long list.
Hurry up, boy. We have a list as long as your arm to do.
Until the weekend, I still have a list as long as your my arm to finish.
I have a list as long as my arm to buy.
I'm sorry mom. I can't help you clean the house today. I have a list as long as my arm to do.
To do domething based on your emotions rather than for rational reasons
I can't believe that Tom beat his classmate. He's always the one who let his heart rule his head.