From Wiktionary, the free dictionary
From ស្ដែង (sdaeng, “to be clear, manifest”) with infixed -VN- (causative).
សម្ដែង • (sɑmdaeng) (abstract noun ការសម្ដែង)
- to show, to display, to manifest, to express (an idea, a feeling), to declare
- to publish, to promulgate (a law)
- to act, to perform on stage