oshiyoせるseru
1.

To approach with great force or numbers, creating an overwhelming presence in a given situation, akin to waves or crowds closing in on a target.

2.

To press or push something toward a specific direction, often resulting in it being closer to a designated area or boundary.

3.

To surge aggressively, as in a natural phenomenon or large group, indicating an unstoppable momentum that overwhelms or floods a space or situation.

4.

To arrive in large quantities and with intense energy, often resulting in a sudden or chaotic impact on the environment or circumstances.

Example:

ダムが切れて流域に大水が押し寄せた。