society > trade and finance > selling > sell [verb (transitive)] > expose or offer for sale > at a lower price than > undercut (3)
spec. To supplant by making a lower offer; to offer services, labour, or goods at lower wages or prices than (another).
To supplant by working for lower wages or payment, or by selling at lower prices. Also: to fall under in cost.
(under-, prefix1 affix 3b + sweat, v. 6b.)