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brown out

B2 neutral inseparable intransitive
In simple words

When electricity gets weak and lights go dim but don't go off completely.

Literal meaning: The lights turn brown/dim rather than going fully black — a direct description of the visual effect.

Meanings

1 B2 neutral

To experience or cause a deliberate reduction in electrical power, resulting in dimmed lights and reduced voltage across an area.

"The utility company decided to brown out several suburbs to prevent a total grid failure."

Grammar: inseparable
2 C1 neutral

(Military) To reduce or screen lighting in an area as a security measure, less complete than a full blackout.

"The coastal town was ordered to brown out during the naval exercises."

Grammar: inseparable
Usage notes

Most commonly used as a noun ('a brownout') in American English. As a verb phrase, 'brown out' is less frequent. Used in electrical engineering, utility, and military contexts. Distinct from 'blackout', which implies total loss.

Commonly used with

power grid electricity lights supply city

Forms

Base
brown out
I/you/we/they
3rd person
browns out
he/she/it
Past simple
browned out
yesterday
Past participle
browned out
have + pp
-ing form
browning out
continuous

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