Day in day out every day without fail phrase.
"Day in, day out, every day without fail" means something that happens on a daily basis
She is so devoted to music that she practices singing and playing musical instruments day in, day out, every day without fail after school
My brother is a soldier who wakes up at 5 am and does physical exercise day in, day out, every day without fail.
I go to school late, day in, day out, every day without fail.
Very frequently and predictably.
This phrase is used based on its literal meaning.
Something or someone has been somewhere and become so familiar that it is hard for you to accept that place without them.
He was here for such a long time, so he was part of the furniture.