To be worth a button

Posted by Ivi on April 03, 2004

Can you help with this phrase

She´d come home knackered, saying, "I´m not worth a button", as she collapsed in a chair.
Does it mean that she is really exhausted?
Thanks for reply.

• Button-holed Henry 03/April/04
  • Tired, so tired ESC 03/April/04