Englishfor English speakers
undermine
Verb
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Someone or something undermines something when they make it difficult for it to happen.
When you yell at people, it undermines our attempt to get these people to be friendly with each other.
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Someone or something undermines something when they dig under it, maybe making it fall.
When it rained, the fast-moving part of the river came too close to the house and undermined one of its walls.
the
Determiner
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Used, instead of a, to reference something specific, already known to exist.
Compare "I read a book." and "I read the book."
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Used with a stress, to show that the word following is special.
Are you the John Smith that I went to school with?
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Used with an adjective that acts like a noun to mean all of the people concerned
The poor are always with us.
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Used with superlatives forms of adjectives and adverbs.
You are the best.
unity
Noun
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Unity is being one, or acting together as one.
Our strength lies in our unity.
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In some types of mathematics the unity is another name for one.