Definition of on/upon impact
- The bomb exploded on/upon impact (with the ground).
: on the surface : on it
: thereafter, thereon
: to fix firmly by or as if by packing or wedging
: to press together
: to have a direct effect or impact on : impinge on
: an impinging or striking especially of one body against another
: a forceful contact or onset
: the force of impression of one thing on another : a significant or major effect
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