Think of 'by extension' as expanding a specific idea to a general rule or group.

Logical Expansion

'By extension' sometimes figuratively extends a concept to make a point clearer.

Not Always Literal

Use 'by extension' to invite others to see the wider implications or applications of an idea.

'By extension' hints at the consequences or further implications of the initial statement.

Use it to build your argument by connecting one established fact to a new, related idea.