pair; couple; antithesis; counter for items that come in pairs; counter for sets (of clothes, small furniture, utensils, etc.)
solely; entirely; only; or
given the situation; now that it has come to this; if it comes to this
now rejoicing, now worrying; swinging from joy to sorrow; glad and sad by turns; alternating hope and fear; unable to put one's mind at ease
strange; unconventional; eccentric; odd; odd number
abbreviation; omission; outline; gist; plan; strategy
easy; trifling; harmless; nothing of the sort; not at all
basics; rudiments; elements; ABCs of ...
principle; general rule; as a rule; in principle; in general
to rise; to swell; to be promoted
aspect; phase; condition; modality (philosophy)
switching over to; migration; transition
scene; setting; scene (in a movie, play); shot; state of the market
aviation; flight; flying; to fly; to take a flight
to line up; to set up; to enumerate; to itemize; to be equal (to); to compare well (with)
standing by; awaiting an opportunity; being on alert
embarkation; boarding (an aeroplane, airplane)
to jump up; to spring up; to move around; to bounce up and down; to pound (of one's heart, e.g. with excitement); to throb
random-access memory; RAM
formation (e.g. of aircraft)
to destroy; to demolish; to disturb; to put into disorder; to relax (one's pose); to make oneself at ease; to break (a bill)
afternoon refreshment; afternoon tea
to boast; to brag; to recite (a song or poem to oneself); to bark; to roar
one theory (opinion); another theory (opinion)
underwear; undergarment; underclothes; lingerie
to fall (e.g. blossoms, leaves); to scatter; to be dispersed; to disappear; to dissolve; to spread
air battle; dog fight; aerial battle
crossing; intersection; (genetic) crossing over
ability; performance; efficiency
ability; competency; talent; skill; capacity
spirit of a true artisan; (a craftsman's) pride in one's work
best one could ask for; just what one wants; welcome (news); heaven-sent
test; trial; probation; ordeal; tribulation
person concerned; interested party; related party