Crossword Genius

Mate has 3 going in both directions (4)

Ross

I believe the answer is:

oppo

I'm a little stuck... Click here to teach me more about this clue!

'mate' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for oppo that I've seen before include "Counterpart; rival" , "China" , "Opposite number (colloq.)" , "Colleague, friend (colloq.)" , "Mate" .)

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