This phrase often metaphorically describes extreme tiredness or effort.

Metaphoric Use

Don't take it literally; it doesn't always involve legs.

Not Literal

It's casual, more likely heard in conversation than formal writing.

Use it to express that something needs immediate attention or replacement.

It highlights a decline or downward trend, especially for inanimate objects.

Suggests that the subject's end or replacement is inevitable and near.

Creates a strong image of something barely functional or operational.

Emphasizes poor condition and the likely need for repair or replacement.