1. Support or backing from ordinary people at the local level, rather than from leaders or authorities; political or social support that originates from the general population
The candidate won the election through grassroots support from community members.
O candidato venceu a eleição através do apoio de base dos membros da comunidade.
2. Widespread support from the common people for a cause, movement, or initiative
The environmental campaign gained momentum thanks to grassroots support.
A campanha ambiental ganhou impulso graças ao apoio de base.