1. With night coming on, we started for home.

2. Because night came on, we started for home.

3. Night came on, and we started for home.
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Q1: Does #1 mean #2 or #3?
Q2: What is the meaning of 'com on'?
What are similar words in mening?

All three mean the same thing. #1 is the best phrasing.

Q1: The sentence #1 could mean either #2 or #3, as the meaning is dependent on the context of the situation. Without additional information, it is not possible to determine the exact meaning.

Q2: The phrase "came on" used in the context of the sentence refers to the onset or beginning of something, in this case, the beginning of the night. It indicates that the transition from daylight to darkness has occurred. The word "on" in this context suggests that the night has started or arrived.

Similar words or phrases that can convey the same meaning include "settled in," "arrived," "dawned," "began," or "started." These words all indicate the start or onset of a specific time or event.