Kechpaja:
This makes me wonder: is there a specific term that we know of meaning "to thrust either end of the bat'leth *downward*"? That seems to be a fairly common move in the combat shown on screen in Star Trek, usually parried by holding the blade horizontal to catch the thrust. Or would you just say {jop} and it would be assumed that that was what you were describing?
I'd expect *Qach* to be used for that motion; it's the same motion you'd use with an axe or club.
SapIr:
In KGT, {Qach} is defined as "wield or swing (a weapon)", without any specification as to which direction the weapon is being swung in, so it seems a bit more general than what I had in mind.
On the other hand, {Qach} is {chaQ} backwards, which would be a very MO thing to do if {Qach} is, in fact, the word for "thrust downwards with a bat'leth".
It's used WRT the bat'leth in the paq'batlh (paq'raD Canto 20: title): pe'vIl mupmeH betleH Qach "The Mighty Blow of the Bat'leth" -- Voragh tlhIngan ghantoH pIn'a' Ca'Non Master of the Klingons