To ease up; back off; slow down. "Lighten up," said the boss to his co-workers. "Harold is a new employee."
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LIGATIA - LIGBC - LIGHT - Light In the Loafers - LIGHTEN - LightRail - LIGI - LIGIE - LIGO - LIH
"LIGHTEN UP." Abbreviations.com. STANDS4 LLC, 2018. Web. 18 Feb. 2018. <https://www.abbreviations.com/LIGHTEN%20UP>.