drop off, This means to take someone or something to a place and leave it there. For example, you can drop off a friend at the airport or leave a package at the post office., drop out, This means to stop being a part of something, like a school or a competition, before it is finished. For example, a student might drop out of college if they feel it is too difficult., drop back, This means to move behind someone or something, usually because you cannot keep up. For example, during a race, a runner might drop back if they are tired and cannot run as fast., drop by, This means to visit someone for a short time without making a special plan. For example, you can drop by a friend’s house to say hello without telling them in advance..

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