You are correct, it is literally "bowstroke"! It would be idiomatically translated as "one bow"; when playing a stringed instrument, one "bow" is pulling the bow in one direction (either an upbow or a downbow, depending...), up until the next direction change. So the point of that line is that you can double-stop, or do spread chords: in a single bow, simultaneously sound two (or more) notes on different strings.
... I don't know how well I've explained that because I've been playing stringed instruments since I was a wee small Alex.
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regna
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Date: 2015-01-29 09:53 am (UTC)... I don't know how well I've explained that because I've been playing stringed instruments since I was a wee small Alex.