Crossword Genius

One of an opening pair (5)

Ross

I believe the answer is:

hinge

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This could be a double definition.

'one of an opening' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

'pair' is the second definition.
The definition and answer can be both to do with contact as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?

Can you help me to learn more?

(Other definitions for hinge that I've seen before include "Door pivot" , "Device for letting door etc swing" , "Fastening for door etc" , "Key principle" , "Door support" .)

I've seen this clue in The Globe and Mail.
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