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Expand your vocabulary: Part 4
Bacterial infection or obstructed circulation causing death or decomposition of body tissue
People doing Gang wars like Green areas. These people are like the gangrene that eat up the entire tissue of mankind.
Close observation, especially of a suspected spy
Imagine surveillance like a Sir doing Vigilance in the exam hall.
Up in the air
Aloft sounds somewhat like 'A Lift'. As a lift is most useful in taking people up, remember the meaning of the word aloft also means 'Up in the air'.