the.com/springboard

A flat piece of wood that turns hesitation into a swan dive.

means A flexible board used to launch a jumper upward with extra force, or figuratively, something that gives you a boost into a new venture.

from A straightforward compound from 'spring' (to leap, or the bounce-back force of a coiled or flexible object) plus 'board' (a flat piece of wood). The diving/gymnastics equipment is first — a board that springs — and English then did what it loves doing, stretching the physical object into metaphor: any opportunity or resource that propels you into something bigger became a 'springboard,' the literal bounce becoming a figurative launch.

physics
stores your energy, then returns it with interest
origin
diving boards predate swimming pools by decades
metaphor use
outearns the literal object in everyday speech
best trait
demands commitment, punishes hesitation mid-bounce
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