in English is:

to boil

,

to fume

,

to go on about

Mutations

Soft:ferwi
Nasal:merwi
Aspirate:(no mutation)
Phrases (4)
berwi drosodd
berwi pen (rhywun):berwi fy (dy, ei, a.y.b.) mhen2
berwi pen (rhywun):berwi fy (dy, ei, a.y.b.) mhen1
berwi’n glychau
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