harden up

World English Dictionary
harden up
 
vb
(intr) nautical to tighten the sheets of a sailing vessel so as to prevent luffing

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Harden up is always a great word to know.
So is doohickey. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
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