Oddly enough I looked this thread up whilst listening, at work, to the Silly Sisters recording, 'cos I couldn't make out all the words. And the next-but-a-few song that my MP3 player threw out was "Bushes and Briars", sung by Jane & Amanda Threlfall. It contains the words, [men] "are so false-hearted, young women to trepan", which I heard while I was reading DG&D Dave's contribution about trepan above (Date: 14 Dec 02 - 07:41 AM). I was familiar (only through having looked it up previously from Bushes & Briars) with that, entrap, meaning of trepan, but my dictionary also gives "trapan" as an alternative spelling, which, with its similarity to "trap", gives some clue to its etymology, perhaps.

I suspect that dick greenhaus's quotation from John Gay has this meaning rather than making a hole in the speaker's heart.