To overpower or overcome completely, often with an excessive amount of something. The sheer volume of work began to overwhelm her, leaving her feeling stressed and anxious.
To defeat completely and decisively. The home team managed to overwhelm their opponents with a score of 5-0.
To cause someone to feel a strong emotional effect. She was overwhelmed with joy when she received the good news.
To submerge, engulf, or bury under a great mass, especially of water or other material. Floodwaters threatened to overwhelm the riverside cottages.