What is the meaning of Restrike?

The striking again of a key, for example on a piano.

A coin newly struck from old dies after the original minting of that coin had ceased.

The reignition of the arc in an arc lamp.

To strike again.

To strike a coin from old dies after the original minting of that coin had ceased.

To reignite the arc in an arc lamp.

Source: wiktionary.org