She was so tired that it was difficult to get through the day. Go through means "to pass through something." "Go through something" is the physical of "go through something," and it is always in the present tense, like "go through a divorce" or "go through a tunnel." After you buy your token, put it in the slot and go through the turnstile. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.