Passing in can mean various things, depending on the context. It can refer to submitting an assignment or completing a task. Synonyms for pass in include hand in, turn in, submit, deliver, present, file, and lodge. These synonyms are useful when you want to add variety in your writing or speech. For example, you can say "I have to hand in my essay before the deadline" or "I will submit my application today." Using synonyms can also help avoid repetition and make your writing more interesting. So, the next time you want to say "pass in," consider using one of these synonyms instead.