What is “chad gadya” really all about?

Question

Why do we sing "chad gadya" at the pesach seder? What is it supposed to be about?

Also, as a side question, is it "d'zabin aba" or "dizvan aba"?

Answer 1

Many explain the song as an allegory for Jewish history, including Rav Baruch halevi Epstein, who uses the following symbology:

Goat = Nation of Israel

Father = God

2 coins = 2 luchos

Other things = Galus

Although he does not go into detail about that last item, he states that the details are evident to the wise. If this is indeed the meaning of the song, it is almost like a miniature version of Shir Hashirim, which is (according to some) another version of the exact same allegory, and is read at the same point in the seder.

There is a footnote in The Practical Talmud Dictionary (p. 98) stating that the correct vocalization is "diz'van".

Answer 2

This is my own interpretation, (based on Jewish sources) but I like it.

• Goat= Israel (the land)
• Father = The Jewish People (If Gd, then who is Hakadosh Baruch hu in the song?!?)
• 2 coins = Luchot (mitzvot)
• Cat (ate the goat) = Modesty. (The talmud states that we can learn tznius from a cat) Our tzniut before other nations lead us to Idolatry, and to 'follow the ways of Cannan) This might need some extra clarification. The idea here is that we saw ourselves as needing to learn from the nations around us, and to 'be like them'. Requesting a king, worshiping their idols etc.
• Dog (only bit the cat, didn't eat)= Arrogance. (The talmud states that dogs are brazen, and corrupt. We ignored the prophets, and believed we knew better than god, leading to the destruction of the temple and our exile)
• Stick (beat the dog, but didn't kill) = The exile of the aristrocrats to Babylonia (Mishlei says that if you don't use the rod on your child they will become spoiled. The stick was the punishment of our loss, so we could learn. .
• Fire (burned the stick)= Churban beit Hamikdash. (the burning of the temple)
• Water (put out the fire) = The Talmud Yerushalmi and Talmud Bavli (Torah is compared to water in many aggadot) Which allowed the Jews to survive outside of Israel and without the beis hamikdash. but came at the sacrifice of writing down the oral tradition.
• Bull (drank up the water) = (litterally Taurus) This is a pun which means few things. 1. Taurus is the astrological sign which comes in Spring, its part of the sacrifices, its also a pun on the word Torah. This represents the success of the Exliarch in Babylon, from where only 40,000 Jews came to rebuild the second temple. Judaism was such a success in Bavel that few came to reclaim Israel and beit Hamikdash, so its also a bad thing.
• Shochet (slaughtered the bull) = The wars and conqurers who destroyed the Exliarch and the remainder of the communities in Israel ending the Gaonic period. (A shochet uses a knife, aka sword, and the gemorah says that one born under the sign of war, will either become a murdere or a shochet)
• Angel of Death (slaughtered the slaughter) = The cause of all empires to rise and fall, causing the destruction of the conqureres and empires that killed or exiled the Jews from their land. (Also a reference to the last plague in Egypt)
• Hakadoesh Baruch hu (slaughtered the angel of death) = Gd, who will ultimately redeem us back to Israel stoping the cycle of rising and falling of empires in the days of Moshiach, as he redeemed us from Egypt.

Answer 3

Regarding d'zabin aba" or "dizvan aba", the former means that he sold while the latter means that he bought.

As to what it means, while it is possible to invest any text with deep meaning, my assumption would be that it is indeed an adaptation of a German children's song. I've noted the shift in verbs from interesting Aramaic ones in the beginning (in the stanzas paralleling the non-Jewish song) to boring Hebrew ones in the frum-ish conclusion.