verb
to divert someone or something from its original course or purpose
adjective
distracted or diverted from the main subject or course
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I got sidetracked by an interesting article while researching for my thesis.
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I got totally sidetracked by cute cat videos on the internet.
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I was supposed to finish my homework, but I got sidetracked by chatting with my friends.
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Don't get sidetracked by small obstacles on your path to success.