Englishfor English speakers
topic
Noun
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A topic is a general idea that someone is speaking (reading, thinking, etc.) about at a specific time.
We were talking about my problems. Don't change the topic.
Our library has books on a wide range of topics.
When you're writing for school, it's important to stay on topic, and not start talking about other things.
thread
Noun
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A thread is a long, very thin, soft material used to join or make cloth.
She pushed the thread through the hole in the needle.
There were loose threads at the bottom of his pants.
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A thread is a process.
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A thread is a group of messages from a discussion on an Internet forum.
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A thread is a structure that allows a screw to be fastened.
thread
Verb
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If you thread something, then you make a string or thread out of it.