add up to: that means the combination of the things that were just mentioned are the reasons why something is the way it is (=result in); or to make a total of
Examples:
1. Sunny weather, guests arriving on time, well-behaved flower girls, and a ceremony going according to plan all added up to a beautiful outdoor wedding.
2. Waking up late, lost keys, a late bus, an argument with a co-worker, and an upset stomach from lunch added up to a bad day.
3. The bill added up to $20.50
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