What does 'On the nod' mean?

Meaning 1:

If something is accepted by parliament or a committee majority, it is on the nod.

Meaning 2:

Someone who's on the nod is either asleep or falling asleep, especially when the shouldn't or are are in a position unusual for sleep, like sitting or standing.

Meaning 3:

When a horse runs, its head moves backwards and forwards alternately - in horse racing, if 2 horses cross the line together the one whose head happens to be going forward often wins and is said to win 'on the nod'.

All idioms have been editorially reviewed, and submitted idioms may have been edited for correctness and completeness.

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