EXAMPLES FROM THE WEB FOR BACK NUMBER
If I have I'm a back number—and I'd a great deal rather be dead.
When I wanted Joe, Dad didn't count, he was nothing to me but a back number.
Yes ma'am, I've read it and I've found out what a back number I've been.
No, he is a back number now, and he will be lucky if it is no worse.
Jim realized that he was a back number, but he hung on just the same.
He once adored Victor Hugo, whom he now treats as a back number.
"Oh, well, it's not so bad for a back number," answered Matt.
No, but then you must remember that father is a back number.
He's a back number, and I'll tell her so, too, if she asks me to say any of her old pieces.
But he isn't a back number, even if his old deserted mill is.