To commit to a significant decision or action, especially one that involves risk or uncertainty.
This phrase originated in the 1800s from the literal act of plunging into water, particularly diving or jumping from a height. The metaphor draws on the moment of commitment required when diving - once you leap, there's no turning back, and you must trust in your preparation and courage.
The water metaphor is perfect because it captures both the fear and the exhilaration of major decisions - like standing on a diving board, the anticipation is often worse than the actual experience. The phrase also suggests that some decisions require a leap of faith rather than cautious steps, acknowledging that overthinking can be paralyzing.
Complete word intelligence in one call. Free tier — 50 lookups/day.