example; instance; precedent; custom; habit
single combat; duel; one-on-one fight
suspicious-looking; shady; questionable; dubious; fishy
has never (done, occurred); there has never been an instance (where); there is no precedent (for)
ignorance; innocence; stupidity
by the way; incidentally; sometimes; occasionally; precisely (at that time); exactly
precondition; prerequisite
staring (e.g. eyes); goggling; glaring
worry; concern; anxiety; care; help; aid
it's OK to ...; it's best to ...; it's alright to ...
numeral; digit; figure; number; a few characters
to curry favour; to butter up; to fawn over; to humour someone (humor); to put in a good mood (e.g. a baby)
signalling with the eyes; exchanging looks; winking
value to society; raison d'être; existence value
duty; responsibility (incl. supervision of staff); liability; onus
copper (Cu); bronze (medal)
general; universal; ordinary; average; (arch.) the same; (arch.) no different
knowing; being aware (of); (an) acquaintance
consequently; as a result; in the end
to knock (ideas) against each other; to present competing ideas; to have a lively exchange of ideas; to smash together; to crash into each other; to throw at each other
mutually; with each other; reciprocally; together; both
to borrow; to rent; to hire; to make use of (another's help, wisdom, etc.); to obtain; to use (for another purpose)
arms race; armaments race
association; union; guild; labor union; labour union; trade union
regulation; (traffic) policing; control; restriction
to employ; to hire; to take on; to charter (a car, boat, etc.); to hire
to attack; to assault; to challenge; to take on; to be bold; to be audacious
to say; to speak; to tell; to be called
to find difficult to guess; to struggle to work out; to be unable to figure out
dealing with; coping with
habitat isolation; compartmentalization; segregation; isolation
a short while ago; a moment ago; just now; some time ago
drafting; requisition; impressment; commandeering; expropriation
to be disconnected; to get out of place; to miss the mark; to get it wrong (e.g. guess, expectation); to be removed; to be excluded
to tie; to bind; to fasten; to restrict (freedom); to tie down (with rules, regulations, etc.); to fetter
activity (esp. energetic or successful); great efforts; active participation; walking about with great vigor
front stage; center stage (of politics, etc.)
period; epoch; the times; those days; oldness; ancientness
to like; to be pleased with; to be delighted with; to take a liking to; to suit one's fancy
to go together; to go in company (with); to go along (with)
to start a journey; to embark on a trip; to set forth; to hit the trail