Spiritual Death Understood as Metaphor

The language employed at Ephesians 2:1,
5 and elsewhere appears to be metaphorical and what
determines the metaphoricity of a particular term,
phrase or sentence is complex. A metaphor may be
judged as such based on semantic or pragmatic factors
(two distinct linguistic features). The figure of
spiritual death is a common one in Scripture and
classical literature. Both TDNT and BDAG have
informative entries on the significance of the Greek
word NEKROS and its meaning in the text under
consideration. For instance, BDAG associates the
term (on one hand) with moral or spiritual
deficiency that renders one (in effect) dead. See Lk
15:24, 32; Rev 3:1. However, another use of this
metaphor may be more related to spiritual obtuseness.
Cf. Mt 8:22; Lk 9:60. TDNT likewise contains references to
the Fathers. See TDNT 4:892-894.

I guess my point is that the signification of
"spiritual death" could reside in the particular Greek
term if a linguistic community had decided that NEKROS
would have the lexical value "spiritual death" in a
given context, C. That is what I mean by semantics.
Conversely, an individual speaker might intend to
communicate the notion "spiritual death" when uttering the adjective NEKROS, etc. That would be a pragmatic usage which
could be understood by appealing to the context of
utterance. Either way, it does not seem that the
meaning for spiritual death is strictly tied to verbal tense;
nor is the metaphor necessarily restricted to meaning "as good as dead because of being in line for destruction," although I
think that is a possible way one might read the text.