This is the 11198th most frequent Portuguese word.
mantivessem
"Maintained" (third-person plural imperfect subjunctive of "manter").
The word "mantivessem" is used here in the subjunctive form to express a request or wish regarding keeping someone informed.
Eles pediram que nos mantivessem informados sobre o progresso do projeto.
They asked that they keep us informed about the project's progress.
Here, "mantivessem" conveys a hypothetical necessity for the players in the subjunctive mood to maintain concentration.
Seria importante que os jogadores mantivessem a concentração durante todo o jogo.
It would be important for the players to maintain concentration throughout the game.
In this sentence, "mantivessem" is used to describe a proposal or advice in the subjunctive mood about preserving traditions.