Is "atashita" short for "atashitachi"?


In an anime episode, I heard a sentence I didn't quite understand. I don't
have the japanese subtitles to be sure, but what I heard is:

> 勝負{しょうぶ}してんだろう、あたした！

The meaning I understand is something like " _It's competitive between you and
me, don't you agree?_ ", and it's what the subtitles seem to means (the
wording is _very_ different), but that would mean あたした is short for 私達, is
that the case?

I know about あたし for 私, the speaker is a woman so it makes sense, but I've
never seen た for 達 before and I can't make sense of the sentence if it doesn't
mean " _you and I_ ".

* * *

It's from _Tomo-chan is a girl_ , Ep. 10, around 3:03.




[Cursory answer since I can't check the episode right now]

No, たち to just た as far as I'm aware. It's more likely she said
「勝負してんだろ、あたしたぁ！」 where 「たぁ」 is a slurring of とは. It's a little 'crude' but the
speaker seems to talk crudely in general.

The sentence is also reversed so in full 「あたしとは勝負しているだろう！」

So basically, the sentence as presented is 'You're having a match with me,
ain'tcha?!'

EDIT: I have checked the episode now. She says 「勝負 **してえんだろ** 、あたしたぁ！」, where
してえ is a crude colloquial pronunciation of したい 'want to do'. 'You wannna
compete with me, don'tcha?!' is how I'd translate it in light of that. From
your transcription I had assumed this to be 「してんだろ」 that's a contraction of
「している（の）だろう」 but that was wrong.

