Crossword Genius

Mothers' blocks? (4)

Ross

I believe the answer is:

dams

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'blocks?' is the definition.
(damming is a kind of blocking)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for dams that I've seen is " game of draughts".)

I've seen this clue in the Sydney Morning Herald.
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