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Old August 28th, 2012 #35
Alex Linder
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chamfering - cutting envelopes with scalpels and then resealing them undetected. (an intelligence technique developed by the British)

tr.v. cham·fered, cham·fer·ing, cham·fers
1. To cut off the edge or corner of; bevel.
2. To cut a groove in; flute.
n.
1. A flat surface made by cutting off the edge or corner of a block of wood or other material.
2. A furrow or groove, as in a column.

[Probably back-formation from chamfering, from French chanfrein, bevelled edge, from past participle of Old French chanfreindre, to bevel : chant, edge (from Latin canthus, iron tire; see cant1) + fraindre, to break (from Latin frangere; see bhreg- in Indo-European roots).]

http://www.thefreedictionary.com/chamfering