quid

noun

1. The inherent nature of something.
2. (US, historical)A member of a section of the Democratic-Republican Party between 1805 and 1811, following John Randolph of Roanoke. (From tertium quid.)
3. Paired with quo, in reference to the phrase quid pro quo (“this for that”): something offered in exchange for something else.

   “[…]; but what is the quo for which they ought to give the quid? you say they ought to give a quid pro quo; what is the quo? […]; did not they give you a pretty handsome quid for the quo there?”

   “It is hard to pull off a quid pro quo if the holder of the quo doesn’t know about the quid.”

4. (historical)A sovereign or guinea, that is, a certain coin or amount of money.

   “They invited him to come to-morrow, […] and bring half a quid with him.”

5. (UK, colloquial)Pound sterling. (usually used with a whole number of pounds)

   “Seven quid for a toastie? Are you taking the mick?!”

   “Isn't this the chance of a lifetime? Have either of you ever made a couple of quids at once in your puff before—pinching goods from the back of delivery vans and smooching lead off empty houses?”

   “Forty quid a fuckin ticket. No shy they British Rail cunts, ah kin fuckin tell ye.”

   “The ride costs exactly fifteen quid, but that doesn't include the tip, and bitter is two pounds a pint.”

   “When I worked in a toyshop, I once bought the manageress a sandwich. Do I still work there? No. Our relationship is, therefore, over. Has she given me the quid back? No.”

6. (Commonwealth, Ireland, colloquial, historical)Various national currencies typically known by the name "pound".
7. (Ireland, broadly, colloquial)Euro.
8. (Commonwealth, broadly, colloquial, rare)Dollar, dollars.
9. A piece of material for chewing, especially chewing tobacco.

   “Then he lay quiet for a little, and then, pulling out a stick of tobacco, begged me to cut him a quid.”

   “He broke off to open a small brass tobacco-box and place a little quid of tobacco tenderly into a pouch in his left cheek, […]”

10. (US, colloquial)The act of chewing such tobacco.

verb

1. To chew tobacco.

   “Ah! the pig-tailed, quidding pirates and the pretty pranks we played”

2. To let food drop from the mouth whilst chewing.