come hell or high water

/K AH1 M HH EH1 L AO1 R HH AY1 W AO1 T ER0/
adverb
  1. 1

    Regardless of the hardships.

    โ€œThe pioneers were determined to build a community in the wilderness come hell or high water.โ€

Source: https://en.wiktionary.org/wiki/come%20hell%20or%20high%20water