'Etymos/on' means 'true, real' in Greek, and etymologists endeavor to find the true origin of words.
Right away we are on treacherous ground: one man's truth is another man's folly. Etymology deals with discovery, not with consensus, says Liberman. If you take the etymological explanations offered in standard dictionaries at face value (and look no further when it says "origin unknown"), you don't need this book.
But let's say you come across a word like 'litter' which can have so many different meanings (scattered rubbish; stretcher; a number of young brought forth by a pig, cat, etc.; straw, hay or the like used as bedding for animals or protection for plants) you can't help wondering how this came about. (Hint: it all goes back to Latin 'lectus'=bed).
Some word origins are quite transparent: it is easy to recognize 'day's eye' in 'daisy'. Onomatopoeic words like clap. flap, swish, buzz, etc. require no difficult analysis. But how is the nail on your finger or toe related to the metal object you hit with a hammer?
Thus we find ourselves in the thicket of etymological research before we quite know how we got there.
How the discipline developed, how it waxed and waned through the centuries and in different countries is a fascinating tale in itself.
"Etymology finds its justification in the belief that words are not arbitrary but meaningful combinations of sounds", says the author. After leading us through various decoding efforts - some gratifyingly successful, others disconcertingly inconclusive - he sheds some light on the methods of etymology, and then gives an overview of the Indo-European sound shifts, Grimm's Law, and the nitty-gritty of historical linguistics. But just when we think we are on solid ground again, we are confronted with multiple violations and exceptions to these rules, and certainty once again yields to doubt.
A treasure trove of references in different languages is incorporated in the notes; they reflect the fierce battles that have been going on between scholars and rival factions and are definitely worth reading alongside the text. (Some typos are distracting - Greek nu confused with upsilon, misplaced hyphens - but they don't spoil the fun).
Liberman has tried to "combine entertainment with instruction", and I think he has succeeded admirably with this book. It does not reek of pedantry, yet manages to sneak in a lot of serious knowledge while maintaining a light, conversational tone. When, at the end, the author invites his readers "to leaf through this book again", you know that you will enjoy it even more the second time around.