The breakdown or loss of cohesion, particularly the separation or splitting apart of materials or substances that were bonded together.
From de- (reversal) + cohesion (from Latin cohaerere, to stick together). The prefix de- indicates a reversal or undoing of the state of being joined.
In materials science, decohesion explains why things break apart at their weak points—it's literally molecules losing their grip on each other, which engineers must account for in everything from bridges to phone screens.
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