spy; agent provocateur; covert operative; maker; builder; constructor
to lurk; to be hidden; to be concealed; to lie dormant; to be latent
handicraft; work; construction; maneuvering; manoeuvering
to untie; to unfasten; to unsew; to unstitch; to solve; to work out; to dispel (misunderstanding, etc.)
cave-in; collapse; sinking; depression (e.g. of the skull); subsidence
almost; roughly; approximately
course; route; course (of study); program; lane (in running, swimming, etc.); course (of action); policy
waterway; canal; channel; swimming pool lane
to be conceivable that; to be thinkable that
absurd; nonsensical; preposterous
to hide; to conceal oneself
rational; reasonable; logical
sensitivity; susceptibility
unit; denomination; credit (in school); in units of (e.g. "in thousands"); in amounts of
condition; term; requirement; qualification; prerequisite
in accordance with; according to; as X, then Y (e.g. as we age we gain wisdom, as wine matures it becomes more valuable, etc.)
pulse; vein; chain (of mountains, etc.); hope; thread (of an argument)
terrain; geographical features; topography
to take out; to get out; to put out; to reveal; to submit (e.g. thesis); to turn in; to publish
to lay waste; to devastate; to invade; to break into; to troll (e.g. web forums); to spam
mischief; prank; pastime; hobby; playing with (a lighter, etc.); fooling around with
work; workmanship; craftsmanship; artifice; trick; device
corner; bend; segment (within a radio or TV program); session; area; department
to get entangled (with each other); to get muddled together
expectation; anticipation; prediction; forecast; conjecture
favorite (top choice) for the championship (favourite); best bet for the title
to go by; to go past; to run (between; of a rail service, bus route, etc.); to operate (between); to go indoors; to go into a room; to penetrate
charge; custody; safekeeping; deposit; storage
always; without exception; necessarily; certainly; without fail; positively
to become independent; to leave one's hands; to leave one's possession
trouble; burden; nuisance; care; dependence; support
shall ...; to assume; to suppose
freebie (e.g. with a purchase); something additional; price reduction; discount; exaggeration
hope; promise; expectation; anticipation; side of a structural member
(unlikely event of) emergency; the worst(-case scenario); (lit.) 10000 to 1; (if) by some chance; by some possibility; in the unlikely event that
great difference; big difference; wide margin