N  latency, implication, latency, inexpression, hidden meaning, occult meaning, occultness, mystery, cabala, anagoge, silence, concealment, more than meets the eye, more than meets the ear, Delphic oracle, le dessous des cartes, undercurrent, implication, logical implication, logical consequence, entailment, allusion, insinuation, innuendo, adumbration, something rotten in the state of Denmark, snake in the grass, secret, darkness, invisibility, imperceptibility, latent, lurking, secret, occult, implied, dormant, abeyant, unapparent, unknown, unseen, in the background, invisible, indiscoverable, dark, impenetrable, unspied, unsuspected, unsaid, unwritten, unpublished, unbreathed, untalked of, untold &c, unsung, unexposed, unproclaimed, undisclosed, unexpressed, not expressed, tacit, undeveloped, solved, unexplained, untraced, undiscovered, untracked, unexplored, uninvented, indirect, crooked, inferential, by inference, by implication, implicit, constructive, allusive, covert, muffled, steganographic, understood, underhand, underground, delitescent, concealed, by a side wind, sub silentio, in the background, behind the scenes, behind one's back, on the tip of one's tongue, secretly, between the lines, thereby hangs a tale, tacitum vivit sub pectore vulnus, where there's smoke, there's fire.

between, between decks, betwixt and between, come between, fraunhofer lines, go between, lines, nobert's lines, read between the lines, war between the states, z'94llner's lines