Fling
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A fling is a basic movement technique in the Portal games. The player places one portal on the ground, then jumps into it from a high place. The momentum they gained from being pushed down by gravity then allows them to be propelled to another location after the direction of travel changes due to the position and orientation of the other portal. Objects can also be flung.
Good examples of flings are on 
testchmb_a_14 (Chamber 18) and 
sp_a3_03 (Cave Johnson).