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Underreckon
- To reckon below what is right or proper; to underrate.
Underrun
- To run or pass under; especially (Naut.), to pass along and under, as a cable, for the purpose of taking it in, or of examining it.
Undersailed
- Inadequately equipped with sails.
Undersaturated
- Not fully saturated; imperfectly saturated.
Undersay
- To say by way of derogation or contradiction.
Undersetter
- One who, or that which, undersets or supports; a prop; a support; a pedestal.