This reminds me of Barfield's "Poetic Diction". Tolkien uses the words
"web" and "lob", well aware of their meanings both then and now; and the
differences between their meanings then and now. It's just one example of
how Tolkien re-enriches our own meaning-fund with all that the words used to
signify. I like the connection between 'dwarf' and 'spider' that is evident
in Northern lore. I expect Tolkien knew of it, and perhaps meant to play
the linguistic joke by having the one try to eat the other.
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