Englishfor English speakers
line
Noun
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A mark that is long, straight and very thin.
She drew a line down the middle of the page to divide the page into two parts.
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A row.
Put the buttons in a straight line on the front of the shirt.
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A row of people who are waiting for something in order; a queue.
You got here last, so you have to stand at the back of the line.
line
Verb
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Someone lines things up when they put them in a straight line or row.
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Someone lines something up when they put it just in the right place or at the edge of something.
Line up the end of the piece of wood with the edge of the table.
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Someone lines up when they start waiting in a line (queue) with other people.
Everyone line up here, please, and I'll help you one at a time.
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Someone lines something when they mark it with one or more lines.
Please line the pitch before the match.
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Someone lines something when they add an inside layer of material (liner) to it.
complex
Adjective
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If something is complex, it has lots of parts or pieces, or is difficult to understand.
He has constructed a complex computer system to send translated messages between humans and dolphins.
A complex problem that we face today is poverty, especially in Africa.
complex
Noun
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A problem.
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A group of buildings with a common purpose, such as a university or military base.
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A psychologically based dislike or fear of a particular thing.
Jim has a complex about working for a woman boss.
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A thunderstorm that forms when two storm fronts collide.
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A structure with a central atom or molecule that has a weak connection to atoms or molecules around it.