Gravy train and Good luck

Gravy train noun - Something given in addition to what is ordinarily expected or owed.

Good luck and gravy train are semantically related. In some cases you can use "Good luck" instead a noun phrase "Gravy train".

Good luck noun - An auspicious state resulting from favorable outcomes.

Gravy train and good luck are semantically related. Sometimes you can use "Gravy train" instead a noun phrase "Good luck".