Подбор синонимов:
were2, drowned2, families1, river1, hurst1, banks1, its1, Many1, disapproval1, Both1, speaker1, speech1, drown1, crowd1- drown out
а заглушать Both the speaker and his speech were drowned out by the disapproval of the crowd. б затоплять Many families were drowned out when the river hurst its banks.