ATM
Automated or Automatic Teller Machine

AV
Alternative Vote (or Voting)

do-or-die
de tudo ou nada

Dutchman
you'll do it, or I'm a Dutchman

either-or
an either-or situation

HBM
His (or Her) Britannic Majesty

HE
His (or Her) Excellency

HM
His (or Her) Majesty

justified
to be justified in doing this or that

knighthood
to get or receive a knighthood

LGBTQ
...and queer  or questioning

LGBTQI
...transgender, queer  or questioning, and intersex

LGBTQIA
...transgender, queer  or questioning, intersex and allies

make-or-break
de tudo ou nada

n.p. or d.
no place or date

NEET
not in employment, education or training

o.n.o.
or near(est) offer

ob.
obiit (he or she died)

OHMS
On Her (or His) Majesty's Service

or
green or red

OR
Operating Room

partly
wholly or partly

predicate
...predicate goodness or badness of something / to predicate of something that it is good

s.v.
sub verbo (under the word or term)

thereabouts
in Cambridge or thereabouts

turn-up
turn-ups or plain bottoms?

whenever
or whenever

whether
I don't know whether he comes or not

wrongly
rightly or wrongly

yuppie
...urban professional or upwardly mobile professional