good luck
interjection
- expression of encouragement prior to a performance
Wiktionary
Pronunciation: /ˌɡʊd ˈlʌk/
intj
- Used to wish fortune on someone or as encouragement; a benediction or valediction.
“Near-synonym: God bless”
noun
- Desirable or beneficial fortune.
““[…] the awfully hearty sort of Christmas cards that people do send to other people that they don't know at all well. You know. The kind that have mottoes like Here's rattling good luck and roaring good cheer, / With lashings of food and great hogsheads of beer. […]””