ないで・な ⇒ なさんな

About ないで・な ⇒ なさんな

As a midway point between ないで 'please don't', and な 'don't!', 関西弁(かんさいべん) uses a unique structure, なさんな. なさんな is a combination of the honorific language word なさる, and the sentence ending particle な.
なさる is a polite (slightly outdated) version of する, used to refer to the actions of others (never oneself). なさる conjugates with the conjunctive form of verbs, meaning that なさんな will also conjugate in the same way.

残(のこ)してもいいから、無理(むり)して食(た)べなさんな。
It's okay if you don't eat everything, don't force yourself to eat it.
彼(かれ)も反省(はんせい)しとるみたいだし、そんなに怒(おこ)りなさんな。
It seems like he regrets what he did, so don't yell at him.
そんな遠慮(えんりょ)しなさんな。
Please don't hesitate.
弁当(べんとう)はこちらで用意(ようい)をするので、弁当(べんとう)は持(も)ってこなさんな。
We will provide you with lunch, so please don't bring your own.

Fun Fact

There are many cases in Japanese where the terminal る (of verbs) will be omitted, due to the shortening of sounds within speech. While this is technically slang, it is a common feature worth memorizing. When る is omitted, it will almost always be replaced by the ん sound, as seen with なさんな. A few more examples are as follows:
するな - Will become すんな, 'don't do!'
踊(おど)るな - Will become 踊(おど)んな, 'don't dance!'
走(はし)る - Will become 走(はし)んな, 'don't run!'

Examples

食(た)べないで。
食(た)べなさんな。
Please don't eat.
寿司(すし)を食(た)べに行(い)かないで。
寿司(すし)を食(た)べに行(い)きなさんな。
(Please) don't go eat sushi.
誰(だれ)にも言(い)わないで。
誰(だれ)にも言(い)いなさんな。
(Please) don't tell anyone.
何(なに)もしないで。
何(なに)もしなさんな。
(Please) don't do anything.
値段(ねだん)を高(たか)くしないで。
値段(ねだん)を高(たか)くしなさんな。
(Please) don't increase the price.
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