A joint or articulation at the back of something, or in machinery, a hinged or flexible connection on the rear component of equipment.
Compound of 'back' (rear) and 'joint' (a connection point). The term appears in technical or mechanical contexts where rear articulation is necessary.
Mechanical engineers love compound descriptive terms like backjoint—it's economical and clear, telling you exactly which joint you need to adjust without lengthy explanations.
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