Snaping is the process of angling the end of a board or beam to match the incline of an adjoining piece. This technique is common in boatbuilding and heavy timber framing where members meet at non-orthogonal angles. A properly snaped joint maximizes the contact area between the two timbers for better load transfer.
Heard on the job
You need to snape the end of that brace so it sits flush against the rafter.