See more synonyms for falling-out on Thesaurus.com
noun, plural fall·ings-out, fall·ing-outs.
  1. a quarrel or estrangement between persons formerly in close association with one another.

Origin of falling-out

1560–70; nominalization of verb phrase fall out; see -ing1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for falling-out

Historical Examples of falling-out