footback - A humorous formation after horseback; Chiefly in phr. on footback = (travelling) on foot.

owing to - in consequence of, on account of, because of

leak - an act of urination                                                                                                    lack

...Extended order simply means skirmishing order

switchback - applied to a form of railway used on steep slopes, consisting of a zigzag series of lines connected by switches, at each of which the train or car is 'switched back' or reversed in direction.

slidder - a trench or hollow running down a hill; a steep slope.

route - a way, road, or course

Hibernia* - Ireland

village

mouldy - wretched, boring, depressing, gloomy, sick

Firbolg - a name given in Irish legend to an early colonizing people of Ireland. 

Tuatha De Danann* - in Irish mythology, a people who inhabited prehistoric Ireland.

goog - an egg

rambler - one who rambles. In later use, one who walks through the countryside on a specified route, freq. in company with others.

ostensible - declared, avowed, professed; exhibited or put forth as actual and genuine: often implicitly or explicitly opposed to 'actual', 'real', and so = merely professed, pretended.

faix = fegs - As an (unmeaning) n. in exclamatory phrases expressing asseveration or astonishment; As simple asseverative.

heeltap - to delay; the liquor left at the bottom of a glass after drinking.

spilth - that which is spilled

weevily - infested with weevils (any beetle classed under the group Rhyncophora, the larvæ of which, and sometimes the beetles themselves, are destructive by boring into grain, fruit, nuts,  the bark of trees, etc.)

popcork - a cork which pops when drawn

rollicking - extremely jovial or gay, boisterously sportive

toper - one who topes or drinks a great deal, a hard drinker

pullon - a garment without fasteners that is pulled on

linnet - a common and well-known song-bird                                                                 linen

collar - something worn about the neck;        bow - a single-looped knot; a necktie, ribbon, etc., tied up in such a knot.

gaunt - a yawn, a gape; gaping

swash - nonsense, worthless stuff

readymade - Of made or manufactured articles: In a finished state, immediately ready for use.

pan-Presbyterian* - of or pertaining to all Presbyterians

poncho - a South American cloak, consisting of an oblong piece of cloth with a slit in the  middle for the head; hence applied to similar garments worn elsewhere.

supereminent - exalted above others in rank or dignity; supremely exalted.

blue ruin* - gin, usually of bad quality (slang)

allocution - the action of addressing or exhorting; hortatory or authoritative address.

bel canto* - singing characterized by full, rich, and broad tone

Oliverian - Cromwellian

drean = drain (obs.)

thrum - to play (a stringed instrument, or a tune on it) idly, monotonously, or unskilfully; to recite or tell in a 'sing-song' or monotonous way; also, to hum over (a melody).

diversed - diversified, different

ould - a representation of an Ir. pronunciation of old

palsied* - affected with palsy, paralysed; fig. deprived of muscular energy or power of action; rendered impotent.

drawl - a slow, indolent utterance

starken - to stiffen, to make stark or inflexible

regal - befitting a king; hence, splendid, magnificent, stately, etc.

crooner - a singer who croons;      croon - to sing (a song, tune, etc.) in a low murmuring undertone.  

exuberant - Of persons, their actions or expressions: Effusive in display of feeling; Now more usually, Abounding in health and spirits, overflowing with delight.

finalize* - to complete, bring to an end

lower - to drink (beer or other liquor); to empty (a bottle or glass of liquor) by drinking.

woolly - having a soft and clinging texture

wisha - an exclamation indicating dismay, emphasis, or surprise.

suck up - to draw up into the mouth by suction

Trojan - a brave or plucky fellow; a person of great energy or endurance: usu. in phr. like a Trojan.

venerate - to regard with feelings of respect and reverence

surplus - that is in excess of what is taken, used, or needed

rotgut - an adulterated or unwholesome liquor; spec. bad small beer, or (in U.S.) inferior whiskey.

sorra - dial. or colloq. f. sorrow (n.)

louser - one who spoils things; Used as a general term of abuse.

malt - malt liquor; Now usu. = malt whisky

churl - Used as a term of disparagement or contempt; base fellow, villain; In modern times usually: Rude low-bred fellow.

relinquish* - to leave behind;         replenished - full.

hogshead - a large cask for liquids; Applied to a person with allusion to the animal. 

firkin - a small cask for liquids, fish, butter, etc.

sly grog* - illicit, illegal