(noun) a cultivating implement set with spikes, spring teeth, or disks and used primarily for pulverizing and smoothing the soil / (verb) to cultivate with a harrow / (verb) torment, vex; pillage, plunder
'Yes, the Harrow', said the officer, 'a good name for it. The needles are set in like the teeth of a harrow and the whole thing works something like a harrow [...]'
realised I had no clue what 'a harrow' was