at all costs

at all costs (not comparable)

1. As an absolute imperative; sparing no effort or expense

   Synonyms: at any cost, by any means, no matter what, (dated) for any sake, for any sakes

   We have to retain the majority at all costs.

   • 2021 December 29, Stephen Roberts, “Stories and facts behind railway plaques: Bournemouth (circa 1880)”, in RAIL, number 947, page 60:

     Of course, closure of the West station took away the hotel's raison d'être. In May 2012, the local newspaper reported that this historic hotel, by then rated the town's worst (exemplified by its final review: "Please avoid at all costs"), was to be converted into 31 first-time-buyer one-bedroom flats.