Dacci oggi il nostro pane quotidiano,

Padre nostro, che sei nei cieli,
sia santificato il tuo nome,
venga il tuo regno, sia fatta la tua volontà,
come in cielo così in terra.
Dacci oggi il nostro pane quotidiano,

Dacci

'Dacci' is actually two words contracted. The first comes from 'dare', yet another common irregular verb:

dare	(to) give, giving
(io) do	I give
(tu) dai	you give
(lui/lei/Lei) dà	he/she/it gives (you give)
(noi) diamo	we give
(voi) date	you give (plural)
(loro) danno	they give

'da'!' or 'dai!' is the imperative form for 'dare' in 'tu' (the familiar you). That is to say, it's how you tell, or ask, someone you're on familiar terms with to give something. 'dai' is pronounced fairly similarly to 'die' in English, and can be used to mean 'come on!', so during the world cup, when it sounded like Monica was urging death upon the Italian team, she was really egging them on.

You may have noticed I put the personal pronouns (I, you, he, she, it) back on the Italian side above. There's a reason for that:
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Subject Pronouns	Unstressed Indirect Object Pronouns
io	mi
tu	ti
lui	gli
lei	le
Lei	Le
noi	ci
voi	vi
loro	gli

"Unstressed Indirect Object Pronouns" just spells "fun", right? I'm honestly trying to make this as painless as possible. Don't worry about the "Unstressed" part anyway. And for what it's worth, German, Koine Greek and (if I'm not mistaken) Latin are far worse when it comes to this part of grammar.

It's called case. Italian here is a bit like English in that you don't usually have to worry about case, but you do when it comes to pronouns. Have another table:

I	me
you	you
he	him
she	her
it	it
we	us
they	them

That's essentially the English equivalent of the above. With any luck it'll make what I'm about to say make a little more sense. Take a look at this:

'He threw it to us.'

Who's doing the throwing? - He is.
What's being thrown? - It is.
Who's it being thrown to? - To us.

The first is called the subject - it's the thing or person that performs the action of the verb.
The second is a direct object - it's the thing that the verb is acting on.
The third is an indirect object - there isn't a direct connection to the action of the verb itself.

Each takes into account the function of the word within the sentence, and if you get it wrong you sound like a caveman:

'Him threw it to we.'

It's the same deal with Italian. 'we' would be translated 'noi', and 'to us' would be translated 'ci'

So, you put 'da'!' and 'ci' together, and you (finally) get 'dacci' - 'give us'

oggi

'oggi' means 'today'.

quotidiano

'quotidiano' means 'quotidian'.