course; route; course (of study); program; lane (in running, swimming, etc.); course (of action); policy
key; lock; key (to a problem, success, etc.); clue
anti-aircraft; antiaircraft
secret techniques (of an art or skill); inner mysteries; essence; quintessence; heart
rotation; revolution; working (e.g. of one's mind); function; turnover (of goods, funds, etc.); circulation
empty air; sky; shunyata (the lack of an immutable intrinsic nature within any phenomenon); emptiness; air force; fruitlessness; meaninglessness
use; application; employment; utilization; utilisation
to hold in one's arms (e.g. a baby); to embrace; to have sex with; to make love to; to sit on (eggs); to brood
one more; another (one); (not) quite; (not) entirely; (not) enough
to swallow; to gulp down; to understand; to grasp; to engulf; to swallow up
unclear; obscure; unknown; unidentified; ignorance; lack of wisdom
of uncertain meaning; ambiguous; cryptic; nonsensical; incomprehensible; perplexing
practice; training; drill; (an) exercise; workout
skillful; skilful; delicious; tasty; good (deal, idea, etc.); profitable
quick-witted; quick to understand
very; considerably; by no means; not readily; middle; half-way point
no!; no no!; no, not at all
theory; reason; logic; (unreasonable) argument; strained logic; excuse
boomerang; swim briefs; Speedos
knowing; being aware (of); (an) acquaintance
to throw at; to fling at; to hurl at; to hurl (abuse, insults, etc.) at; to use (rough language) with (someone)
at hand; on hand; way of moving one's arms; skill; money at hand; pocket money
general; universal; ordinary; average; (arch.) the same; (arch.) no different
principle; theory; fundamental truth
dynamic lift; lifting power
(Fleming's) right-hand rule
to put together; to combine; to join together; to match against (e.g. in a sport)
mass; quality and quantity
reasonable (price, fee, fare, rate, etc.); reasonably priced; affordable; reasonable (judgment, policy, response, etc.); appropriate; sensible
bow and arrow; weapon; arms
use; utilization; utilisation; application
no-risk; risk-free; without risk
to be broken; to break; to break (down); to stop working; to fall through (of a plan, deal, etc.); to collapse
practical use; application; making good use of; conjugation; inflection
have a good day; take care; see you
right above; just above; directly above; directly overhead
to be taught; to learn; to take lessons in
to hit (e.g. one's head); to strike; to throw (at); to fling (at); to vent (e.g. one's anger); to express (one's feelings)
laws of nature; physical laws; physics