The attested ME forms of _twitten_ (e.g. 'atte Twyten' in 13th c. Sussex surnames) point rather to an OE *_twiten_, related to German _Twiete_ 'narrow lane, alley'.

Paul Cullen

Should not be confused with the origin OE twicen  cf.  twitchel
 

Downs:     rolling grassland, especially the chalk downs of Sussex (OE origin dun) ***
                          or combe in the downs
Dean died out in the 14th century, but may have been accidently revived for a (dry?) valley or a dip in the downs (found in place names).

Meads:     meadow *,  flow-meads = meadow sometimes flooded (by tidal inundations and by a freshwater burn)

Dishwasher:   bird called the Pied Wagtail **

Clobberhead:   small marine fish with the scientific name of Taurulus bubalis **

Sea Frog:  small marine fish of the Blenniidae family with the scientific name of Lipophrys pholis*                                          (colloq.  from Tom Smith of Shoreham c. late 1970s)

Hamm: water meadow, allotments  (OE  hamm) *  I think this must mean an enclosed pasture rather than a hay meadow.

Buntings: small paelomonid prawns **

Trug: wooden basket (special hand-crafted type) ***  punnet-like

Shepherd's Crown:   fossil of the urchin Micraster ***,  Echinocorys scutatus is the Fairy Loaf

Coombe: a hollow (landscape) * (word used in place names)

Recent English studies of topographical place-name generics have suggested that the coiners of names were very conscious of the lexical content of the element and that they did not bestow lexically inappropriate names upon topographical features. The Anglo-Saxon settlers in England, for example, would seem to have used denu of a valley that was long compared to its width and had moderately steep sides, whereas valleys that were short compared to their width, sometimes bowl-shaped, sometimes trough-like, and frequently deep for their size, were referred to by the tern cumb, a loanword borrowed from the native British (Cole 1982).
from  http://www.ramsdale.org/dalr.htm

Innings: land reclaimed from marsh or from the sea *

Fainites, Fains: truce (children) ***

Sussex Marble: paludina limestone  **  ???

Rife: small stream running out to the sea ***

Moak:    (the meaning of this word is not known:  it could be the mesh of a fishing net ??? ) *
     Hastings Corporation Records 1604 records moak as the mesh of a fishing net, perhaps from the Anglo-Saxon Masc?

Withy:   willow (tree) ***  or the branches called withies.

Clunch: **See link (click on this text)

Bostal: path up the side of a steep hill   **

Hurst: small hill (? meaning) Dictionary definition link

Hardhead: (the smaller of the Knapweeds) Centaurea nigra (wild flower). *

Stroud: marshy woodland (invented word by Andy Horton on 4 March 2002)   OE strod

Souter :  leather worker (early 20th century)

Slonk:
 Also Slank
This must be from 'slant' simply meaning a slope. (I have changed my mind about the topography on this one. Not a muddy depression of the farm location.)

Chequer: Fruit of the Wild Service Tree. The public house name connection is a fallacy because the chequer symbol was almost universal as a secondary sign on alehouses/taverns/inns in the past (Janet Pennington, talk on 21 May 2004, Shoreham Society).

Sussex Pudding:   A suet (pie) with nothing inside of it. (cf. Yorkshire Pudding)  Source:  Granny Blount.

Hogboat: A special type of fishing boat that fished out of Brighton, but now only seen in paintings.

Large Heath:  Gatekeeper Butterfly (now superseded and redundant)
Hedge Brown:   Female Meadow Brown Butterfly (now superseded and redundant)
Wood Argus:  Speckled Wood Butterfly (now superseded and redundant)
Gay: Shoreham is a film community (or was in the 20th century). Gay means gay (not homosexual) and to avoid offence and misunderstanding by Artisans, it is best to avoid the use of this word.

Shaw:  a small wood; thicket; copse

Notes:  "We will not be druv"     (This is a hand-me-down saying, but my knowledge is exiguous, so I do not know if it is significant). Actually, I do not if any of the above except for twitten, downs, rife, dishwasher, combes and buntings are ever used very often. If you are interested I can provide my sources for these words.