What does smoothed away mean?

[Smoothy]

Synonym Search, Intermediate level

ESL/EFL Test #115 "Synonyms for mistake and blunder", question 9

At the beginning of our marriage we had some ......... but little by little we smoothed them away.

(a) mistakes
(b) faults
(c) misunderstandings
(d) gaffes

Synonym Search, Intermediate level

ESL/EFL Test #115 "Synonyms for mistake and blunder", answer 9

At the beginning of our marriage we had some misunderstandings but little by little we smoothed them away.

Correct answer: (c) misunderstandings
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What does smoothed away mean?

Smoothy

[Lost_Soul]

Here it is used with the meaning of "got rid of them"
But you always can use a dictionary available
smooth