Fromunder- +‎bid.

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underbid (third-person singular simple presentunderbids,present participleunderbidding,simple past and past participleunderbid)

1. Tobid too low.
2. To bid lower than another.
3. (bridge) To bid less than the full value of a hand of cards.

underbid (pluralunderbids)

1. Abid that is lower than another.

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