lighten

¹ American  

[lahyt-n] / ˈlaɪt n /

verb (used without object)

1. to become lighter or less dark; brighten.

   The sky lightened after the storm.

2. to brighten or light up, as the eyes or features.

   Her face lightened when she heard the good news.

3. to flash as or like lightning (often used impersonally with it as subject).

   It thundered and lightened for hours.

4. Archaic. to shine, gleam, or be bright.

   steel blades lightening in the sun.

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verb (used with object)

1. to give light to; illuminate.

   A full moon lightened the road.

2. to brighten (the eyes, features, etc.).

   A large smile lightened his face.

3. to make lighter or less dark.

   Add white to lighten the paint.

4. Obsolete. enlighten.

5. Obsolete. to flash or emit like lightning (usually followed by out, forth, ordown ).

   eyes that lightened forth implacable hatred.

lighten ² American  

[lahyt-n] / ˈlaɪt n /

verb (used with object)

1. to make lighter in weight.

   to lighten the load on a truck.

2. to lessen the load of or upon.

   to lighten a cargo ship.

3. to make less burdensome or oppressive; alleviate; mitigate.

   to lighten taxes;

   to lighten someone's cares.

   Synonyms:

   reduce, lessen, ease

   Antonyms:

   aggravate

4. to cheer or gladden.

   Such news lightens my heart.

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verb (used without object)

1. to become less severe, stringent, or harsh; ease up.

   Border inspections have lightened recently.

2. to become less heavy, cumbersome, burdensome, oppressive, etc..

   His worries seem to have lightened somewhat.

3. to become less gloomy; perk up.

   People's spirits usually lighten when spring arrives.

lighten ¹ British  

/ ˈlaɪtən /

verb

1. to become or make light

2. (intr) to shine; glow

3. (intr) (of lightning) to flash

4. (tr) an archaic word for enlighten

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lighten ² British  

/ ˈlaɪtən /

verb

1. to make or become less heavy

2. to make or become less burdensome or oppressive; mitigate

3. to make or become more cheerful or lively

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Other Word Forms

• lightener noun

Etymology

Origin of lighten¹

First recorded in 1300–50; Middle English lightnen; light ¹, -en ¹

Origin of lighten²

First recorded in 1350–1400; Middle English lightnen; light ², -en ¹

Explanation

To lighten something is to make it brighter or shine a light on it. You can lighten your dark basement room with plenty of lamps and a coat of white paint. Besides "make lighter or illuminate," another meaning of lighten is "make lighter in weight." So you can lighten your load by taking all the heavy books out of your backpack. Figuratively, "to lighten" is to be more cheerful or relaxed, as in: "She decided to lighten the somber mood in the room by telling a few of her funniest knock-knock jokes."

Example Sentences

Benjamin Brundage used GIFs to lighten the mood as he uncovered details of a network of hacked devices launching huge cyberattacks.

From The Wall Street Journal • Apr. 3, 2026

"We don't like taxes on fun," he said, adding: "We are going to find every possible way to lighten the load."

From BBC • Mar. 31, 2026

If individual investors and large institutions collectively decide to lighten up on their dollars, it will leave a mark.

From Barron's • Feb. 19, 2026

She added that her brief interaction with Coen seemed to lighten the mood a bit in the room.

From Los Angeles Times • Jan. 14, 2026

The girl’s eyes widened when the sky began to lighten, as the snakes continued to make their way into the morning, fingers of fire carving up the lavender expanse and setting pictures in motion.

From "Orphan Island" by Laurel Snyder

Related Words

• alleviate
• ameliorate
• cut down
• dilute
• ease
• facilitate
• lessen
• mitigate
• mollify
• relieve