The episode turns “brain” into language for intelligence, ideas, expertise, and hard thinking. The expressions differ in who contributes: a brain trust advises, a brainchild is an individual idea, and brainstorming is a group process.
Cultural note: “Brain drain” often refers to skilled people leaving a country or region; it can carry political or economic implications. “Brainwash” is a serious negative claim about coercive influence, not a casual synonym for changing your mind.
Keep exploringSome brain expressions describe a person, others an idea, and still others the work of thinking together.
Phrase guide · 5 expressions
Explore the expressions
Original explanations and examples, created for learners. Save a card for later or hear the phrase spoken by your browser.
People and expertise
Name a group of advisers or a person responsible for an idea.
a brain trust
Meaning
A group of knowledgeable people who advise a leader or organization.
Tone & use
Often used in policy, business, and planning contexts. It refers to the group, not a single “smart person.”
Example
“The mayor invited a brain trust of engineers and public-health experts to review the flood plan.”
NeutralNeutral / professional
Recognition caution
a brain drain
Meaning
The departure of highly educated or skilled people from a country or region.
Tone & use
Common in discussions of migration and economies. Avoid describing people as resources that belong to a place.
Example
“The report studied whether limited research funding contributed to a brain drain from rural universities.”
NeutralFormal / economic
Discuss the social and economic conditions without implying that people owe their skills to one place.
Creating ideas
Describe an original idea or a collaborative thinking session.
a brainchild
Meaning
An idea, plan, or project created by a particular person.
Tone & use
Often used with “someone’s brainchild.” It does not mean the person’s actual child.
Example
“The neighborhood tool library was Lina’s brainchild, but dozens of residents helped build it.”
PositiveNeutral / figurative
brainstorm
Meaning
Think of many possible ideas, often together, before choosing one.
Tone & use
Common in school and work settings. A brainstorm can be exploratory; it does not guarantee every idea is practical.
Example
“The team brainstormed low-cost ways to make the workshop accessible.”
NeutralNeutral / professional
Thinking hard
Talk about puzzles and effortful thought.
rack your brains
Meaning
Think very hard to remember or solve something.
Tone & use
Usually used when someone is struggling to find an answer or recall information.
Example
“I racked my brains for the name of the café, then found it in the old message thread.”
NeutralInformal / idiomatic
Knowledge check
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Choose the expression that best fits each situation.
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A director invites several specialists to advise on a plan. What group might this be?