1) "We went over to his house."
2) "We went to his house."
They are similar in meaning. Literally, "over" imparts a sense of travelling across something, which could be a road, a town, a river, etc. However, in practice "over" in "go over to" may have little concrete meaning, and may be used more as a kind of idiomatic lubrication, or to suggest a relatively short distance.
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They are similar in meaning. Literally, "over" imparts a sense of travelling across something, which could be a road, a town, a river, etc. However, in practice "over" in "go over to" may have little concrete meaning, and may be used more as a kind of idiomatic lubrication, or to suggest a relatively short distance.