Antonym: overground. Similar words: undergrowth, undergraduate, ungrounded, ground, undergo, grounds, round and round, background. Meaning: n. 1. a secret group organized to overthrow a government or occupation force 2. an electric railway operating below the surface of the ground (usually in a city). adj. 1. under the level of the ground 2. conducted with or marked by hidden aims or methods. adv. 1. in or into hiding or secret operation 2. beneath the surface of the earth.
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121. Excess electricity can also be used to compress air in an underground store.
122. It is humiliating to realize that when you drive yourself underground, when you fake who you are, often you do so for people you do not even like or respect. Nathaniel Branden 
123. They were joined by underground train drivers in the capital.
124. If it is chosen, the underground site could start receiving canisters of waste in 2010, Olds said.
125. A workman has died and another was seriously injured after an underground water pipe burst.
126. Every Underground movement that goes overground is devoured by banality.
127. An underground company that isn't dominated by the grey men in suits.
128. Can an underground newspaper be prohibited from criticizing school policies?
129. The third issue provided four pages on London's underground film festival.
130. Their seeds had remained dormant underground for years or come from a few surviving specimens.
131. There is widespread concern among scientists about the safety of storing nuclear waste underground.
132. Their pasty faces - the result of long periods underground - belie their extraordinary strength and tenacity.
133. One group have lost their legs altogether and taken to burrowing underground.
134. Ruth's mind seemed to be changing and collapsing with these wonders; and the underground cold ate into her.
135. This one had lustreless brown hair, very straight, hanging about a pale, underground face.
136. The environmental coalition also has proposed some type of barrier to prevent further expansion of the underground plume.
137. Woodchucks, like many other ground squirrels, hibernate in their underground burrows where they are thought to sleep away the winter.
138. If you are going to put an electric cable underground, you must use the special heavy-duty type.
139. Yet Laura failed to conquer fully her fear of water or enclosed places and was never able to use underground trains.
140. Longwall mining is a highly mechanized and highly productive method of underground mining.
141. I once read a case in the newspaper about a man who jumped in front of an Underground train.
142. A private consortium has financial backing for a scheme to build an entire underground toll-road system.
143. In defiant frustration, Nicole dabbles in the underground Seattle rock scene,[sentencedict.com] where the older guys are equally alluring and dangerous.
144. Will he recommend a cheap and cheerful service for the underground, or a new compensation plan of chocolates and flowers?
145. Boys were jammed together like rush-hour travellers on the Underground.
146. In London he gradually took over the Underground system and came to control every line except the Metropolitan.
147. As with domestic refuse, the problems of methane gas generation also exist when disposing of industrial waste underground.
148. The architects also used the hill to house an underground parking garage.
149. He was a professional musician and the concourses of the Underground were his auditorium.
150. Not surprisingly, a slot in the Underground can be a big boost to the careers of unknown painters.
More similar words: undergrowth, undergraduate, ungrounded, ground, undergo, grounds, round and round, background, playground, founder, common ground, groundwater, groundswell, flounder, undergarment, middle ground, on the grounds of, surrounded, round, under, around, round up, all round, round off, wounded, founded, bounded, under way, thunder, plunder.