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REFERENCE

key in on

phr. v..
B2 Upper Intermediate Oxford General-service

phr. v.. to focus closely on something important or noticeable, often in a context of analysis or attention.

phr. v.. to concentrate on or identify a specific detail or aspect; transitive phrasal verb with inseparable particles, typically used in contexts requiring deliberate attention or analytical focus.


SIMPLE

The detective keyed in on the suspect's accent.

CONTEXTUAL

During the meeting, the manager keyed in on the budget issues.

COMPLEX

The analyst keyed in on the subtle inconsistencies in the report, leading to the discovery of fraud.

Particles
in on
Separability
inseparable
Pattern
key + in + on + object
Usage

typically followed by a specific detail or aspect being focused on.

Teaching tip

contrast with 'focus on' (more general) and 'zero in on' (more intense); 'key in on' implies a deliberate analytical focus rather than casual attention.

Pitfall

He keyed in the details.He keyed in on the details.'on' is required to indicate the focus; 'key in' alone means to input data into a system.

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