Prun·ing n.
1. The act of trimming, or removing what is superfluous.
2. Falconry That which is cast off by bird in pruning her feathers; leavings.
Pruning hook, or Pruning knife, cutting instrument used in pruning trees, etc.
Pruning shears, shears for pruning trees, vines, etc.
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pruning knife
n : a knife with a curved or hooked blade