~す causative (older / colloquial)
grammar1 sentence
The older or colloquial causative form ~す/~さす, an alternative to the productive ~せる/~させる. Survives in fixed expressions and casual speech: 済ます, 怒らす, 笑わす, 喜ばす. Volitionals 済まそう, 喜ばそう.
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