一いっ斉せい安やす

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Meanings

1

noun

all-round decline; broad market drop

Financial term for a simultaneous decline across most stocks or sectors in a market.

斉adjusted, alike, equal

安relax, cheap, low

全ぜん面めん安やす
全面安 also means a broad decline, but 一斉安 emphasizes the simultaneous nature of the drop across the board.

Compound of 一斉 (いっせい, 'simultaneous') and 安 (やす, 'cheap' or 'decline' in market context).