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What does なんだろ mean in the following sentence?

太陽が夜に、なんだろ、「日が沈む」といいます。

なんだろ itself means something like "I wonder", but how does it suits in that
sentence?
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2022-08-31T13:44:06.770
96060
2022-09-01T02:43:03.013
2022-08-31T14:36:48.180
52002
52002
question
meaning
What does なんだろ mean in this sentence?
See how it's surrounded by commas. It's probably "what can I say?" or "how
should I put this?" added as a [parenthetical
aside/interjection](https://www.dailywritingtips.com/8-types-of-parenthetical-
phrases/).
CC BY-SA 4.0
2022-09-01T02:43:03.013
96064
2022-09-01T02:43:03.013
5010
96060
answer