i'm not welsh.
but this is.

idioms
O! Mam bach!
(exclamation)
(lit.) oh, little mother.

mewn picil
in a difficult situation
(lit.) in a pickle

wedi mopio ar
he or she is totally infatuated or thrilled with
(lit.) he or she is totally mopped with

bwrw cyllyll a ffyrc
to rain heavily
(lit.) to rain knives and forks

bwrw hen wragedd a ffîn
to rain heavily
(lit.) raining old ladies and their sticks

cadw ci a chyfarth ei hun
hire a servant but do all the work
(lit.) keep a dog and bark yourself

rhywun-rhywun
anybody, without caring who it might be
(lit.) somebody-somebody

ceir llawer cam gwag drwy sefyll yn llonydd.
empty steps are made when standing still

y cyw melyn olaf
youngest in the family
(lit.) the last yellow chick

haws twyllo maban na gwrachan
A boy is easier cheated than an old lady

rhoi'r ffidil ar y tô
call it quits
(lit.)put the fiddle on the roof

siarad trwy fy het
talking nonsense
(lit.) to talk through my hat

welsh phrases & pronunciation
iechyd da
pronounced: yakki-da
means: good health (a toast)

Bydd Ffrancwr yn aros amdanoch tu allan i'r ysbyty.
A Frenchman will be waiting for you outside the hospital.

-Wyt ti'n meddwl bod Brian wedi bod yn cael affêr?
-Dydy e ddim cystal â'i frawd.
- Do you think Brian's been having an affair?
- He's not as good as his brother.

wrth gicio a brathu, mae cariad yn magu
whilst kicking and biting, love develops.