in the last resort
in the last resortFORMAL
COMMON You use in the last resort when stating the most basic or important fact that will still be true in a situation whatever else happens. They would in the last resort support their friends whatever they did. He was aware that, in the last resort, their authority depended on the control they had over the King.
in the last resortwhatever else happens or is the case; ultimately.
1991 John Caldwell Oxford History of English Music In the last resort it was only Italian singers who could command the attention of the public in a large theatre.