Literally "at putting". It is used in a variety of idiomatic expressions:
"Tá sé ag cur sneachta" (It is snowing), etc.
It sounds like 'cur-taish'
'Ag Críost an Síol' is in Gaeilge, the Irish language.
ag eistaigh
tuillte ag...
ag baint céim
ag canadh
ag déanamh
Fishing = ag iascaireacht
An bhfuil tú ag dul ag rith tráthnóna?
Ag troid means fighting in english.
ag meangadh gáire
It means dancing