lighten up

lighten up

1. To brighten something in color. I think some new highlights will lighten up your hair and really refresh your look.
2. To act less seriously or sternly. In this usage, "lighten up" is a set phrase. A: "I think he definitely needs to be grounded." B: "Oh, lighten up—it's not like you never made stupid mistakes as a kid."
3. To cause someone or something to become less serious or stern. It's a funeral—nothing you do will lighten up the mood.
See also: lighten, up
Farlex Dictionary of Idioms.

lighten something up

to make something lighter or brighter. Some white paint will lighten this room up a lot. The sunlight came in and lightened up the kitchen.
See also: lighten, up

lighten up (on someone or something)

to be less rough and demanding or rude with someone or something. Please lighten up on her. You are being very cruel. You are too harsh. Lighten up.
See also: lighten, up

lighten up

to become lighter or brighter. (See also lighten up (on someone or something).) We applied a new coat of white paint to the walls, and the room lightened up considerably. The sky is beginning to lighten up a little.
See also: lighten, up
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

lighten up

Become or cause to become less serious or gloomy, and more cheerful. For example, Lighten up, Sam-it'll turn out all right. This slangy expression transfers reducing a physical weight to a change of mood or attitude.
See also: lighten, up
The American Heritage® Dictionary of Idioms by Christine Ammer.

lighten up

v.
1. To make something appear lighter in shade: The artist lightened up the paint by mixing in some white. Those mirrors really lighten the room up.
2. To become lighter in shade: These pants are too dark now, but they will lighten up after they've been washed a lot.
3. To make something more pleasant and less serious or depressing: The jokes lightened up the tone of the meeting. I didn't mean to be disrespectful—I was just trying to lighten things up.
4. To take matters less seriously: Everything will work out fine, so stop worrying and lighten up.
See also: lighten, up
The American Heritage® Dictionary of Phrasal Verbs.

lighten up

Don’t be so serious, relax. Originally, this slangy imperative, dating from the 1940s, meant to calm down, but in succeeding decades it took on its present meaning. Tracy Kidder had it in Among Schoolchildren (1989): “Me and my precious schedules . . . I’ve got to lighten up. Chill out.”
See also: lighten, up
The Dictionary of Clichés by Christine Ammer
See also:
  • refresh (someone, something, or oneself) with (something)
  • refresh with
  • have gray hair
  • gray hair
  • give (one's) right arm
  • give right arm
  • give your right arm
  • would give your right arm for
  • would give your right arm for something/to do something
  • brighten
References in periodicals archive
The 34-year-old says Lighten Up works because it shows people how to live like someone who is already healthy and slim.
Lighten Up claims that 66 per cent of people lose weight permanently by following its 'slimming from the head down' philosophy and although Jo has only just started instructing her first course - at the David Lloyd Centre in Solihull - she says personal experience has shown her the difference the Lighten Up philosophy can make.
Based on the author's highly successful workshops, Lighten Up teaches specific skills and proven techniques that keep the fluidity and creativity of humour right there when you need it, in life's most serious and stressful situations.
Wednesdays from 9:00-10:30am, Asana & Flow at Lighten Up! Thursdays from 4:00-5:30pm, Iyengar & Flow at Cindy Dollar Yoga Studio.
Iyengar-style Yoga Classes with Adam Laufer in Asheville, NC at Lighten Up Yoga Center, 60 Biltmore Ave.
Wednesdays, 4-5:20pm: Beginner I&ll Yoga at Lighten Up! Yoga Center, 60 Biltmore Ave in Asheville.