on the blink

Definition

Usually of a mechanical or electrical device, functioning erratically, malfunctioning; not working or not working well.

Etymology

Presumably from an appliance with poor electrical connection blinking from intermittent connection.

Example Sentences

• "My toaster is on the blink, making either charcoal or cold bread."
• "I'm so tired, I haven't slept a wink / I'm so tired, my mind is on the blink"