This is the 507th most frequent Slovak word.
doplnil
"Filled in" or "completed."
In this context, 'doplnil' is the past tense of 'dopĺňať' and means to add or provide something that was missing.
On doplnil chýbajúce údaje do formulára.
He added the missing information to the form.
Here, 'doplnil' reflects completing or expanding an argument or thought.
Po diskusii doplnil ďalšie argumenty na podporu svojho názoru.
After the discussion, he added further arguments to support his opinion.
In this usage, 'doplnil' indicates elaborating or clarifying a concept with additional explanation.