something to remember somebody by
something to remember (one) by
A memento or keepsake to remind one of someone. I'll miss you too. Here, keep my hat—something to remember me by.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
something to reˈmember somebody by(informal) a punishment, especially a physical one: If I ever catch you stealing my apples again, I’ll give you something to remember me by.
Farlex Partner Idioms Dictionary © Farlex 2017