1. Diminishing or decreasing support; backing that is becoming weaker or less prevalent over time
The politician faced waning support among younger voters.
O político enfrentou apoio decrescente entre os eleitores mais jovens.
2. A gradual reduction in endorsement, backing, or assistance for a person, cause, or initiative
The project suffered from waning support after the initial funding was cut.
O projeto sofreu com o apoio decrescente após o corte do financiamento inicial.