Green’s Dictionary of Slang

(Irish) a large number.

1968		(con. 1930s) J. Healy Death of an Irish Town in Irish Times n.p.: We went back to the doss house and there was a meal. I couldn’t peck it, cove; anyway I had a rake of sandwiches me mother made me and I pecked them and went to bed [BS].
1991		T. Delaney Where We Sported and Played 50: Crunchy carrots and rakes and rakes of delicious big chips.
1998		J. O’Connor Salesman 25: They were worth a rake of money.
2015		L. McInerney Glorious Heresies 47: There wasn’t exactly a rake of Cusacks in Cork.
2019		A. Killilea Boyo-wulf at https://boyowulf.home.blog 20 Mar. 🌐 Sure half the time Scyld Scefing was off among a rake of enemies.