to work too hard; to try too hard; to strain oneself; to overdo it; to go too far
improvement (e.g. in skill, ability); advance; progress; communication of opinions of the general populace to those of high rank
protagonist; main character; hero(ine) (of a story); head of household
to digest; to break down; to break to pieces; to be able to use; to be good at; to finish; to complete
all-purpose; utility; universal; all-powerful; almighty; omnipotent
to hurry; to rush; to hasten; to make something happen sooner
sympathy; compassion; pity
technical skill; ability; capacity
practical use; application; conjugation; inflection
pupil; student; schoolchild
zeal; enthusiasm; ardor; ardour
token (effort); something done for form's sake
beyond expectation; contrary to expectations; unexpectedly
noxious gas; poisonous gas; toxic fumes
land mine; topic that sets someone off; sensitive topic; something that seems fine at first but turns out to be very bad (e.g. product, business); booby trap
snare; trap (for catching wild game, etc.); trap (i.e. ruse, subterfuge, etc.)
(one's) exclusive use; private use; dedicated use; use for a particular purpose; exclusive use (of particular products); using only (e.g. a certain brand)
to suffice; to serve the purpose; to be satisfied
gas (state of matter, e.g. poison gas, natural gas); gasoline; gas; dense fog; thick fog; gas stove
to mind (negative nuance); to care about; to worry; to pay undue (amount of) attention to (something)
hollow; low ground; basin; pit; dip; depression
underground; below the ground; world of the dead; the grave; underground (activities, movement, etc.); secret
had better ...; had better not ...
reverse; opposite; converse (of a hypothesis, etc.); inverse (function)
various; varied; diverse; all sorts of
type; kind; type (of person); (ideal) type; typewriter; typing
to be buried; to be covered; to overflow; to be crowded; to be repaid (e.g. debt); to be replenished
as it is; as one likes; because; condition; state
so; like this; in this way
small; fine; minute; minor; trivial; sensitive
chief; main; principal; major
wasteland; wilderness; deserted land; prairie; vast plain; wilds
wood; lumber; (raw) material; stuff; talent; ability
to use; to make use of; to utilize; to utilise
trace; vestige; mark; sign; evidence
marked; pronounced; showing a strong tendency (towards)
road; path; route; way; distance; journey; road (e.g. to victory)
easy; likely to ...; have a tendency to ...; easy to ...
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
rate; ratio; proportion; percentage
to rise; to go up; to enter (esp. from outdoors); to come in; to enter (a school); to advance to the next grade; to get out (of water)
safety confirmation; confirming (something) is safe