Use 'plunge in' to express a keen start on new tasks without hesitation.

Enthusiastic Start

Shows active involvement in an activity, often group related like discussions or tasks.

Active Participation

Implies complete dedication to an activity right from the start.

Means to literally enter water by jumping or diving, often used with bodies of water.

Can imply seeking relief or enjoyment by entering water.

Often associated with fun activities during warm weather conditions.