Under subjugation.

Alternative form of underresourced

Alternative spelling of underserved.

The spread or other predicted value for wagers.

In bed, under the bed covers. / (idiomatic) In secret.

(Internet) A pop-up advertisement that appears behind the window that triggers its appearance, and thus cannot initially be seen.

(automotive) Of internal combustion engine designs, having piston diameter less than its stroke distance.

Alternative spelling of undergrounder

plural of under-grounder, an alternative spelling of undergrounder

(intransitive, idiomatic) To yield or cooperate when pressured or forced to do so.