Lucky break British informal noun
An exceptionally lucky or advantageous event.
His family lived in misery until a lucky break enabled him to make a comeback.
Having a chance to study abroad was a lucky break for her.
Linda's lucky break came when she was offered an executive position.
"Lucky break" is attested from 1884 in billiards; 1872 as "failure or break-down which turns out to be fortunate."
To start doing something enthusiastically and energetically
We have a lot of work to do today, so let’s get stuck in.