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precipice - A very sleep side of a cliff or a mountain.

At the top of the mountain, they gasped when they looked over the precipice in front of them.

noun

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outbreak - A sudden start or increase of something harmful, especially a disease or conflict.

The outbreak of the flu led to school closures across the region.

noun

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doomsday - The end of the world, or a time when something very bad will happen, such as great destruction.

Those who are most concerned about global warming describe a doomsday future where coastal ciites will be under water.

adjective

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caustic - Sarcastic or severely critical, often in a hurtful or biting manner; or able to burn or corrode organic tissue, typically referring to chemicals or substances.

The caustic chemical spilled onto the floor and quickly started to eat away at the floor surface.

verb

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lurk - (of a person or animal) To be hidden so as to wait in ambush for someone or something

Artie lurked under his sister's bed so he could jump out and scare her when she least expected it.

adjective

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onerous - Oppressively heavy or troublesome, often involving responsibility or duty.

The manager gave him an onerous task that took the entire week to finish, working late into each night.

verb

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blast - To explode or destroy something or someone with explosives, or to break through or hit something with a similar, very strong force

While building the tunnel through the mountain, the construction crew blasted its way day by day until it was finished.

verb

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perish - To cease to exist or come to an end; disappear or be destroyed.

Many brave soldiers perished in the battle.

noun

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tremor - A slight shaking movement, such as one caused by an earthquake or instability; also a subtle or faint sign of emotion, such as fear or excitement in the voice or body.

Because he was nervous, his voice had a significant tremor during the presentation.

noun

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inferno - A large fire that is dangerously out of control

The raging inferno that was consuming the forest would be a big challenge for the firefighters.

noun

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peril - Serious and immediate danger

Roger was aware of the peril of shark-infested waters, but he truly realized it when it was too late.

verb

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collide - What happens when a moving object hits something violently

The captain was totally surprised when the Titanic collided with the iceberg.