Why is the る left off すぎる in this sentence?


Here is my sentence.

> おしろ あんたが頼みすぎなんだよ。

First, I'm not sure what おしろ means, perhaps somewhat could inform me since
Jisho and google translate are both giving results that I don't think are
correct. I'm thinking it's some sort of slang.

Now for the main question. I believe the なんだ to be the explanatory の and this
sentence means, "(The thing is) You ask for too much." What's the reasoning
for taking the る off here? すぎ would be the stem of すぎる. Every example I've
ever come across of explanatory の with a verb has not used the stem. What's
the difference here?




Masu-stem of a verb often [works as a
noun](https://japanese.stackexchange.com/a/32311/5010). Here 頼みすぎ is a _noun_
meaning something like "over-asking".

Also note that 頼みすぎ is followed by な, which comes only after a noun or a na-
adjective. 頼みすぎるなんだ is plain ungrammatical. Please check [this
list](https://japanese.stackexchange.com/a/5399/5010) for the usage patterns
of explanatory-な.

Compare:

>   * 彼は食べ過ぎだ。 He is eating too much. (Literally "As for him, it's over-
> eating")
>   * 彼は食べ過ぎる。 He (always) eats too much.
>   * 彼は食べ過ぎるんだ。 It is that he (always) eats too much.
>   * 彼は食べ過ぎている。 He is eating too much.
>

As for おしろ, I also guess you've misread
[むしろ](https://jisho.org/search/%E3%82%80%E3%81%97%E3%82%8D). Or it may be
someone's name.




Masu-stem of a verb often [works as a
noun](https://japanese.stackexchange.com/a/32311/5010). Here 頼みすぎ is a _noun_
meaning something like "over-asking".

Also note that 頼みすぎ is followed by な, which comes only after a noun or a na-
adjective. 頼みすぎるなんだ is plain ungrammatical. Please check [this
list](https://japanese.stackexchange.com/a/5399/5010) for the usage patterns
of explanatory-な.

Compare:

>   * 彼は食べ過ぎだ。 He is eating too much. (Literally "As for him, it's over-
> eating")
>   * 彼は食べ過ぎる。 He (always) eats too much.
>   * 彼は食べ過ぎるんだ。 It is that he (always) eats too much.
>   * 彼は食べ過ぎている。 He is eating too much.
>

As for おしろ, I also guess you've misread
[むしろ](https://jisho.org/search/%E3%82%80%E3%81%97%E3%82%8D). Or it may be
someone's name.

