(UK) 'A nod's as good as a wink' is a way of saying you have understood something that someone has said, even though it was not said directly.† The full phrase (sometimes used in the UK ) is 'a nod's as good as a wink to a blind horse'.
This indicates that the person described is unaware of his or her good fortune or is unaware of how difficult day to day life was before he/she was born. Typical usage: 'Kids today don't know they are born'.
To end on a muted note - most likely in a situation where one would have expected a more spectacular finish. This expression was coined by T.S. Elliot in his 1925 poem, The Hollow Men, which ends: This is the way the world ends This is the way the world ends This is the way the world ends Not with a bang but a whimper.
This means that something is worthless and dates back to when someone would travel around the countryside repairing things such as a kitchen pot with a hole in it. He was called a 'tinker'. His dam was used to stop the flow of soldering material being used to close the hole. Of course his 'trade' is passť, thus his dam is worth nothing.