abnormal; unusual; extraordinary; remarkable; uncommon
robbery; pillage; seizure; hijacking; plunder; extortion
event; affair; incident; case; plot; trouble
occurrence; incidence; generation (of power, heat, etc.); production; ontogeny; development
fixed number; certain number; given number; definite number
sudden; abrupt; rapid; sharp; drastic; radical
to twine; to get tangled; to be involved (e.g. of money in a matter); to get involved (in); to pick a quarrel (with); to find fault (with)
suitable; proper; appropriate; perfunctory; half-minded; sloppy
reason; grounds; pretext; excuse; motive
perhaps; possibly; maybe; if; in case; in the event that
to come to see; to come and see; to visit
it's different when ... but; it's not so bad when ... but
explosive; sudden and dramatic (of an increase in sales, popularity, etc.); explosive; rapid
expansion; extension; magnification; enlargement; escalation; spread
at the same time; at once; just as ...; the moment ...; (but) at the same time; as well as
(a) step; one step; level; stage; small degree; small amount
by any chance; (should) it happen (that); by some chance
serious; earnest; real sword (as opposed to a wooden practice weapon)
relation; connection; relevance
aid; help; assistance; assistant; counselor; counsellor
chief; main; principal; important
being in charge (of an area of responsibility); being responsible (for a work role, etc.)
police affairs; military police
brutal (atmosphere, society, etc.); savage; fierce; violent; bloodthirsty; stark
skirmish; brush (with the enemy); minor battle; squabble; (petty) quarrel; argument
intensification; aggravation
neighbouring country; neighboring country; adjacent country
border (between countries); national border
neighborhood; neighbourhood; vicinity; environs; surrounding area; district
dispute; conflict; trouble; unrest; strife
spy; secret agent; spying
class; order; et cetera; etc.; equal; iso-
mutually; with each other; reciprocally; together
check; keeping in check; containment (of enemy forces); diversionary action; pickoff throw; holding (a runner) on base
limit; limits; degree; extent; the end; the last; as long as ...
in general; generally; mostly; gist; point; main idea