: to knock onward : knock forward
specifically
: to knock (the ball in rugby) forward in the direction of the opponents' dead-ball line with the hand or arm
"
: produced or projected as a result of the collision of an energetic particle (as a neutron or fission fragment) from outside an atom with an elementary particle inside
a knock-on shower of particles
a knock-on atom
a knock-on electron
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Merriam-Webster unabridged
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