The two meanings of the word surveyed in the pun by Thoreau you have thus surveyed he country on every side within a dozen miles of where you live are to mark boundaries and to look over visually.
In this pun by Thoreau, "surveyed" has a double meaning. The first meaning is to physically explore or examine the country by walking around it, and the second is to assess or study the country in a broader sense through observation and reflection.
In Thoreau's pun, the two meanings of the word surveyor are "to mark boundaries" and "to look over visually."
◘ To mark boundaries and to look over visually. surveyed
Thoreau is using the literary device of puns in this sentence.
To mark boundaries and to look over visually-apex
Pun. surveyed
Surveyed -Apex
It prevents that person from exploring within.
Technical terms.
Inwardly; within the enveloping surface, or the boundary of a thing; within the body; beneath the surface. Or On or from the inside.
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the symbolic meanings within a media text.
The symbolic meanings within a media text
Academic words