From naqaph; a threshing (of olives) -- shaking.
see HEBREW naqaph
H5363. noqeph
נֹ֫קֶף noun [masculine] striking off; — only construct כְּנֹקֶף זַיִת as (at) the striking of olive-trees Isaiah 17:6; 24:13 (simile of fewness of people after ׳י's judgment).