crop vs sluice box

crop

noun
  • Tin ore prepared for smelting. 

  • The lashing end of a whip. 

  • A plant, especially a cereal, grown to be harvested as food, livestock fodder, or fuel or for any other economic purpose. 

  • A group, cluster or collection of things occurring at the same time. 

  • A photograph or other image that has been reduced by removing the outer parts. 

  • The foliate part of a finial. 

  • The head of a flower, especially when picked; an ear of corn; the top branches of a tree. 

  • An entire short whip, especially as used in horse-riding; a riding crop. 

  • An outcrop of a vein or seam at the surface. 

  • An entire oxhide. 

  • A rocky outcrop. 

  • A pouch-like part of the alimentary tract of some birds (and some other animals), used to store food before digestion or for regurgitation; a craw. 

  • A short haircut. 

  • The natural production for a specific year, particularly of plants. 

  • A group of vesicles at the same stage of development in a disease. 

  • The act of cropping. 

verb
  • To remove the outer parts of a photograph or other image, typically in order to frame the subject better. 

  • To remove the top end of something, especially a plant. 

  • To cause to bear a crop. 

  • To beat with a crop, or riding-whip. 

  • To yield harvest. 

  • To mow, reap or gather. 

  • To cut (especially hair or an animal's tail or ears) short. 

sluice box

noun
  • A box with riffles along the bottom, used to trap heavier gold particles as water washes them and the other material along the box. 

How often have the words crop and sluice box occurred in a corpus of books? (source: Google Ngram Viewer )