1. Definition: Bias (noun/verb) = a tendency to favour or oppose something unfairly, often without being fully aware of it.

At its core, bias means your judgment is tilted in one direction. You’re not looking at something neutrally — your views, experiences, or preferences are influencing how you see it. The tilt can be toward something (favouring it) or against it (opposing it).

In everyday modern English, bias appears everywhere — in news reporting, hiring decisions, scientific research, personal opinions, and even in algorithms. When someone has a bias, they may genuinely believe they’re being fair, but their perspective is shaped by factors they might not recognise. That’s what makes bias tricky: it often operates unconsciously.

As a verb, bias means to unfairly influence something — to tilt it in a particular direction. If something biases a result, it distorts it away from what’s true or fair.

The word can describe individual attitudes (personal bias), systematic unfairness (institutional bias), or distorted information (media bias). Recognising bias — in yourself and others — is seen as a sign of critical thinking and intellectual honesty.

Examples from the street:

• “The article has a clear political bias” → it favours one side unfairly
• “Don’t let your feelings bias your judgement” → don’t let emotions distort your thinking
• “Everyone has unconscious biases” → we all have hidden tendencies we’re not aware of

2. Most Common Patterns

• bias toward/towards + noun → tendency to favour something
• bias against + noun → tendency to oppose or disfavour something
• have/show a bias → display unfair preference or prejudice
• bias + noun (verb) → unfairly influence something
• unconscious/implicit bias → hidden bias you’re not aware of
• confirmation bias → tendency to notice only evidence that supports your existing beliefs

3. Idioms

Note: There are no common idioms directly containing “bias” — these are related expressions:

• a level playing field → a situation without bias where everyone has equal opportunityExample: “We need a level playing field — no bias in the selection process.”
• have blinders on → be unable to see beyond your own bias or narrow viewExample: “He’s got blinders on — he can’t see how biased his argument is.”

4. Example Sentences

1. The report showed a clear bias toward the company’s own products→ It unfairly favoured what the company was selling.
2. Hiring managers must be aware of unconscious bias→ Hidden preferences can unfairly influence who gets the job.
3. The journalist was accused of showing bias against the opposition party→ Her reporting seemed to unfairly disfavour one political side.
4. Confirmation bias makes us ignore evidence that contradicts our beliefs→ We tend to notice only what supports what we already think.
5. Knowing the student’s background might bias the teacher’s assessment→ That information could unfairly influence how the work is graded.
6. The way the question was worded could bias the responses→ The phrasing might push people toward a particular answer.
7. It’s hard to judge your own work without bias→ Personal attachment makes neutral evaluation difficult.
8. The law aims to eliminate bias in the justice system→ It tries to remove unfair influences on legal decisions.

5. Personal Examples

1. Teachers should avoid letting familiarity bias their grading→ Knowing a student well might unfairly influence the marks they give.
2. I try to notice my own bias toward learning interesting words over practical ones→ I naturally favour exciting vocabulary even when common words matter more.

6. Register: Neutral

✔ Native usage tips

• “Bias toward” means favouring; “bias against” means opposing — the preposition matters
• “Biased” (adjective) is very common: “That’s a biased opinion”

✔ Similar expressions / words

• Prejudice → stronger and more negative, often about people or groups
• Partiality → more formal, favouring one side
• Slant → often used for media, a particular angle or bias in reporting