falling out

Short definition from Wiktionary

Noun

1. 1
   A rift between people or groups, often following a disagreement or quarrel
2. 2
   A culture-bound syndrome primarily reported in the southern United States and the Caribbean, described as a constricted consciousness as a psychological response to anxiety and stress.
3. 3
   Alternative form of falling out.

Verb

1. 1
   present participle and gerund of fall out