煞有介事

shà yǒu jiè shì

Meaning

to make a show of being very much in earnest (idiom); to act as if one is taking things very seriously

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Characters

煞shādemon, fiend; baleful, noxious刍攵灬有yǒuto have, to own, to possess; to exist月介jièagent, go-between, intermediary; to introduce; shell, armor人事shìaffair, matter, business; to serve; accident, incident一口彐亅