Linchpin

linchpin
1. A locking pin inserted in the end of a shaft, as in an axle, to prevent a wheel from slipping off.
2. A central cohesive element
3. a person or thing regarded as an essential or coordinating element
Usage
Like a linchpin, the little fastener used to prevent a wheel from sliding off the axle, staff and technical sergeants may not be well-known, but they are indispensable. They are the middle ranks in the enlisted rank structure, essential building blocks of the enlisted force and are often the Air Force’s technical experts.
dvidshub.net
Etymology
also linch-pin, late 14c., earlier linspin, from M.E. lins "axletree" (see linch) + pin (n.). The peg that holds a wheel on an axle; now mainly figurative.

Bumf

bumf
1. Printed matter, such as pamphlets, forms, or memorandums, especially of an official nature and deemed of little interest or importance.
2. Toilet paper.
Usage
So a medical translation is put through the linguistic hoops and the hourly rate reflects the cost; a bunch of bumf for a pamphlet perhaps gets just the once-over.
nzherald.co.nz Jul 23, 2012
Etymology
papers, paperwork," 1889, British schoolboy slang, originally "toilet-paper," from bum-fodder.

Dune

Dune
A ridge of sand created by the wind; found in deserts or near lakes and oceans.
Usage
The driver of a four-wheel-drive adventure bus that rolled in sand dunes near Lancelin last year, leaving tourists with serious spinal injuries has been charged for not having a licence to drive the vehicle.
smh.com.au
Etymology

1790, from Fr. M.Du. or M.L.G. dune, all perhaps from Gaulish *dunom (thus related to down (n.2)). The French word (13c.) is held to be an Old French borrowing from Germanic. Dune buggy attested by 1965.

verdigris

verdigris
a green or bluish patina formed on copper, brass, or bronze surfaces exposed to the atmosphere for long periods of time, consisting principally of basic copper sulfate.

Etymology
c.1300, from O.Fr. verte grez (13c.), verte de Grece (late 12c.), lit. "green of Greece," from obs. Fr. verd, from L. viridis (see verdure). The reason for it being called that is not known.
Usage
Two lots of Walter Lamb tubular verdigris bronze patio chairs and an ottoman, each lot comprising two pieces, also sold above their estimates, realizing $1320 and $1560
news-antique.com

Please visit  Auctigo

Albatross

Albatross
1 Any of several large, web-footed sea birds of the family Diomedeidae that have the ability to remain aloft for long periods. Compare wandering albatross.
2 A seemingly inescapable moral or emotional burden, as of guilt or responsibility.
3.something burdensome that impedes action or progress.

 Etymology

1670s, probably from Sp./Port. alcatraz "pelican" (16c.), perhaps derived from Arabic al-ghattas "sea eagle" [Barnhart]; or from Port. alcatruz "the bucket of a water wheel" [OED], from Arabic al-qadus "machine for drawing water, jar" (from Gk. kados "jar"), in reference to the pelican's pouch (cf. Arabic saqqa "pelican," lit. "water carrier"). Either way, the spelling was influenced by L. albus "white." The name was extended, through some mistake, by English sailors to a larger sea-bird (order Tubinares). 

Usage
"It's about time we won a game from behind. It's been a bit of an albatross around our necks that every time we have gone behind we have either drawn or lost. It's nice to reverse that.
bbc.co.uk Saturday, 19 March 2011

Please visit  Auctigo