noun, plural sawteeth [saw-teeth] .
one of the cutting teeth of a saw.
any of the small parallel roof structures forming a sawtooth roof.
having a zigzag profile, similar to that of the cutting edge of a saw; sawtoothed; serrate: a sawtooth mountain range.

1595–1605; saw1 + tooth Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sawtooth (ˈsɔːˌtuːθ)
1.  (of a waveform) having an amplitude that varies linearly with time between two values, the interval in one direction often being much greater than the other
2.  having or generating such a waveform

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It seems that economic choices and policies follow a sort of sawtooth trajectory.
Such stuff is a fitting complement to those little pieces of green sawtooth plastic used in presentation in many sushi places.
Sawtooth oak seedlings do not do well in poorly drained soils or in areas subject to flooding.
The bottomless sky, the mountains' clutches of snow, the horizon's never-ending sawtooth of coniferous trees.
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