Crossword puzzle clue "on one's last legs"

"I go on four legs in the morning, on two legs in the afternoon, and on three legs in the evening ..."

Source of the maxim "Four legs good, two legs bad"

On one's last legs?

On one's last legs

"___ my last legs"

Horses on their last legs

Pencil on its last legs

Pencil on its last legs