To arrive at the end of something, especially something difficult; Summary 1The word "through" can be used as a preposition, adjective, or an adverb in a sentence to mean "completion, passing, going, or extending to" while the word "thru" is the colloquial version of the word 2The word "through" is used in formal writing and sentences while the word "thru" is used informallyFinish something I got through the speech without making a single mistake It took me a week to get through the book 2 get through withTo bring something to an end;
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