syrthio allan

Welsh

Verb

syrthio allan (first-person singular present syrthiaf allan, not mutable)

1. (idiomatic) to fall out, to cease to be friendly

   Synonym: cwympo allan

   1. (idiomatic, with â) to fall out with
2. Used other than figuratively or idiomatically: see syrthio,‎ allan.

Further reading

R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “cwympo”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies