How to say "plunge" in Japanese

• 飛び込みとびこみCommon
  nounCovers the plunge as an active, voluntary jump or dive into something, most naturally water. It suits contexts like plunging into a pool or the sea, where the movement is chosen rather than accidental.
• 転落てんらくJLPT N1approx.Common
  noun, suru verb, intransitive verbCovers the plunge as an uncontrolled fall or tumble, as when someone plunges down stairs or from a height. The movement is involuntary, so it is not the word for a deliberate dive into water.

Choose 「飛び込み」 when 'plunge' means a deliberate jump or dive into something, typically water, and 転落 when it means an involuntary fall or sudden drop, such as tumbling from a height.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 飛び込みとびこみjump
• 転落てんらくfall
• ガタ落ちガタおちsharp drop
• 逆飛び込みさかとびこみheadlong dive