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Here is the context said by a boy who was training in boxing.

> 左ジャブで敵の体勢をくずし 突破口を見いだしたらば すかさず右ストレートを打つべし これ拳闘の攻撃における基本なり... **とくら**

I have found some sites explaining that it is changed from と来る but I still
don't get it.
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2016-06-10T01:44:59.303
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2017-04-04T06:23:26.443
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question
verbs colloquial-language manga contractions
What does the word 「とくら」 mean?
It's slurred …と来るわ (or possibly …と来れば but in this case it's the former, if I
remember correctly).
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2016-06-10T03:36:54.100
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2016-06-10T03:36:54.100
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「～～とくら」 is a colloquial and masculine Tokyo way of pronouncing 「～～と + くる + わ」.
This contraction just so quintessentially sounds Tokyo, working-class and
"tough-guy-like".

(Unlike what many J-learners seem to firmly believe, this 「わ」 is **_not_** a
feminine sentence-ender.)

I am going to call this 「と」 quotative just because there is no other
explanation that seems feasible in my brain.

「～～とくら」, in OP's context, is indeed difficult to explain as it is far more
nuanced than the words used in the phrase would suggest. If I had to attempt a
free translation, I would probably go with expressions such as:

**_"~~ is the attitude I am going to take"_**

**_"~~ is what I want to declare"_**

**_"~~ is what I believe"_**

I said the 「と」 was quotative because the speaker is quoting his own opinion,
belief, etc. here.
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2016-06-10T05:47:20.867
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「とくら」is a colloquial deformation of 「… とくるは」meaning ① “speaking of,” ② “It
comes out as …, It's outcome is …” and ③ “in addition.”

In 江戸っ子弁 – Edo (Tokyo)-ite parlance, it used to be pronounced […とくらア].

It was used in the following ways:

①あいつ **とくら** 、いつも嘘（うそ）ばかり言ってやがる – (Speaking of him) he’s always telling lies.

②あいつは性根（しょうね）が悪い上に、骨（ほね）の髄（ずい）までド吝（けち） **とくらあ** 、仕様（しよう）のねえ野郎（やろう）だ - He is
not only ill-natured, but stingy to his bones. He’s hopeless.

③上の娘（むすめ）の結婚式（けっこんしき）の上に、息子（むすこ）の大学進学（だいがくしんがく） **とくら** 、今年（ことし）は物入（ものい）りだ –
My elder daughter is getting married. (In addition) my son is going to
university. I’m really in trouble with a lot of expenditures this year.
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2016-06-12T03:54:46.520
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answer