What is the idiomatic meaning of turn and talk? For example:
I turn and talk like a man leaving charges before a journey.
It isn't an "idiom"; it's poetry, in "Song of Myself, 43" by Walt Whitman - 1819-1892. Words of poems don't have to have a literal, everyday meaning. The preceding lines and words introduce various ideas to do with rotation, so 'turn' is appropriate.
Looking forth on pavement and land, or outside of pavement and land,
Belonging to the winders of the circuit of circuits.
One of that centripetal and centrifugal gang I turn and talk like a man leaving charges before a journey.