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I am trying to obtain a full understanding of the below line of dialog:

> 「とっ、ともかく、明日までにはきちんと用意しておくので、百瀬さんは軽い気持ちで来てください。あ、決してナメてかかれというわけではなく……」

The only tricky part to me is ”ナメてかかれ”, for which I think is based on "嘗めてかかる"
which seems to mean "look down on someone"
([ref](http://thesaurus.weblio.jp/content/%E5%98%97%E3%82%81%E3%81%A6%E3%81%8B%E3%81%8B%E3%82%8B))

However, I don't know why かかれ is used instead of かかる here.

Can anyone explain the reason or nuance involved?
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2017-01-15T06:10:40.907
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2017-01-15T14:59:55.553
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conversational
かかれ as used in the expression「ナメてかかれ」
>
> 「とっ、ともかく、明日{あす}までにはきちんと用意{ようい}しておくので、百瀬{ももせ}さんは軽{かる}い気持{きも}ちで来{き}てください。あ、決{けっ}してナメてかかれというわけではなく……」

The clue to your question regarding the conjugation choice of 「かかれ」 over 「かかる」
is already in the quote. The key word here is " ** _parallelism_** ".

The speaker makes a request as to how Momose-san should go/come to the event.
The speaker first says 「軽い気持ちで **来てください** 」(" ** _Just come over
casually_**."), which is clearly in a request/imperative form. Then, s/he adds
to say 「決して **ナメてかかれ** というわけではなく・・」 ("I don't mean to say ' ** _Look down on
it/them!_** ' or anything but..."), the first part of which （ナメてかかれ） is also
in an imperative form.

That is parallelism, where the second (and third, etc.) words/phrases
naturally follow the footsteps of the first as far as grammar.

That is two requests, or rather one request expressed in two different ways --
with the first one decribed more generally and the second , more specifically.
**Please note** that in this case, the second part is not a _real_ request as
it says "I won't say (second request)" but the author still maintained the
grammar form parallel to that of the first request.

What would happen if one chose to say 「ナメてかか **る** というわけではなく」 instead? Nothing
dramatic, really. It just would **_not_** flow as smoothly as with 「かか **れ** 」
because it would lack parallelism. The native ears in any language just do not
miss those little things.
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2017-01-15T06:53:43.427
42546
2017-01-15T14:35:52.980
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answer
The point is 「という」 after 「ナメてかかれ」.

This 「と」 is a particle of quotation, which takes a whole sentence before it.
So 「ナメてかかれ」 can be looked at as a separate (sub-)sentence.

In this point of view, you might notice that **「かかれ」 is an imperative form of
「かかる」**.  
Thus, 「決してナメてかかれというわけではなく」 means "I never mean you should take it lightly".

* * *

As a side note, I translated 「ナメてかかる」 (== 「嘗めてかかる」, as you guessed) as "take
it lightly" because the target of 「ナメてかかる」 is not limited to a person.  
Though I'm not sure what the context is, the verb 「かかる」 here is fairly likely
to mean something like "deal with" or "handle".  
「なめる」 adds a somewhat negative nuance of thinking lightly of something.
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2017-01-15T11:38:23.277
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