# fasten on

CEFR C1 · Phrasal verb

Source: https://englishreference.com/word/fasten-on
Updated: 2026-04-24

## Definition

to give all your attention to an idea or a person, often because you think they are the cause of a problem.

For teachers: to direct one's attention or suspicion toward a specific person, idea, or object; often used when a person selects a single explanation or target from several possibilities.

## Examples

- The police fasten on the main suspect very quickly.
- Critics were quick to fasten on the small mistake in the report to discredit the whole project.
- The media tended to fasten on the senator's controversial past rather than focusing on his current policy proposals during the debate.

## Pitfalls

- Not "They fastened on to the idea." but "They fastened on the idea." — while 'fasten onto' is common for physical attachment, 'fasten on' is the standard phrasal verb for directing attention or blame.

## Usage notes

- usually followed by a noun or a gerund representing the focus of attention.
- Teaching tip: contrast with 'fixate on' (which implies a psychological obsession) or 'focus on' (which is neutral); 'fasten on' often implies a sudden or opportunistic choice of focus.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.