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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61. The ANC was forced to go underground when its leaders were arrested.
62. The spy never told his family about his underground activities.
63. The mole bored underground.
64. The main problem for engineers was the location of underground rivers in the area.
65. When he was doing underground work he was arrested because a renegade informed against him.
66. The Communist Party was forced underground, and its leaders went into hiding.
67. Power is fed into the electricity line through an underground cable.
68. They are accused of organising and financing an underground youth movement.
69. Underground nuclear detonations are believed to have been carried out.
70. His perspicacious grandfather had bought the land as an investment, guessing that there might be gold underground.
71. There is an underground passage from the church to the house.
72. If you want to get around London fast, the Underground is your best bet.
73. The underground cavern was formed where water used to flow.
74. An underground organisation has claimed responsibility for the bomb explosion.
75. They were trying every possible means to rescue the miners trapped underground.
76. He is claiming damages from London Underground(Sentencedict.com), which has admitted liability but disputes the amount of his claim.
77. The electricity line is fed with power through an underground cable.
78. At its peak in the Thirties, Underground design and architecture was all of a piece.
79. Drinking water is brought to the village through a network of underground pipes.
80. Ten miners were trapped underground when the roof of the tunnel fell in.
81. Underground cables carry electricity to all parts of the city.
82. These US dollars were smuggled into the country during the war, to aid the underground.Sentencedict.com
83. He was a courier for the Polish underground and parachuted into Warsaw.
84. It was like the Black Hole of Calcutta on the underground this morning.
85. The river runs through several underground caves which store the water for the city's use.
86. The Northern Line is the worst on the London Underground.
87. After the violent clashes of 1981 they either went underground or left the country.
88. The inves-tigators found that the underground pipes were badly corroded.
89. The escaped prisoners were eventually trapped in an underground garage and recaptured.
90. Coal mined underground generates an 8 percent gross royalty.
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.