The figurative meaning of the phrase “set the wall between us” in the poem “Mending Wall” is to build a barrier between people. This figurative is taken from the "Mending Wall" poem by Robert Frost which specifically made to criticize the customs of setting a barrier between people. This part shows the poet messages.
The wall in Frost's poem represents a barrier built between the two neighbours.
The two men gather every spring to mend the wall that divides their land. They have a good relationship, but not a deep one. The wall represents this separation between the two characters, the barrier that does not allow them to know each other truly.