to open one's eyes wide (in anger, surprise, etc.); to goggle at
prototype model; experimental machine
nonetheless; nevertheless; but; (and) yet
operation (of a machine); running; working (and earning money); workload; deployment (e.g. to a production environment); release
one machine; one aircraft; one life
trial product; prototype model
single edge (e.g. sword blade); single bevel (e.g. kitchen knife)
vertical; portrait-style; longitudinal
edge (of a knife or sword); blade; prong (of an electrical plug)
top and bottom; high and low; going up and down; rising and falling; going and coming back; upper and lower classes; ruler and ruled
making a round trip; going and returning; round-trip ticket; return ticket; correspondence; exchanging (of letters)
war; fighting; fierce competition
early days; early years; early stages; initial stages; beginning
center; centre; middle; -centered; -centred; -focused
weapon; arms; ordnance; weapon (something used to gain an advantage); asset
guard; protector; defensive armament; personal armor (armour)
repair; mending; fixing; servicing
blacksmithing; forging; smithery; blacksmith; smith
failure; mistake; blunder
so-so; passable; now, now; there, there; my, my; oh my!
(weather) front; front line; the front; battlefront
you could say that; that might be so
small; little; slightly less than; just about; somewhat; somehow
to hurt; to ache; to feel a pain; to be injured; to be spoiled (e.g. food); to be damaged
power; motive power; three-phase electricity
pumping up water (e.g. to a high place for energy storage)
quilt; bedspread; cover (for a kotatsu quilt); cloak; smock
popularity; favour; defense; defence; agreement; receiver of technique (e.g. in martial arts)
to stretch; to extend; to straighten out; to be flattened; to spread (of paint, cream, etc.); to stretch out (e.g. of a hand); to extend
to sprinkle water on (something); to spray water on; to splash water on; to hinder; to hamper; to stifle
heavy; weighty; heavy (feeling); depressed; slow; sluggish; important (position, responsibility, etc.)
retention; maintenance; preservation
horsepower; hp; energy; vitality; horse-drawn cart
way; method; means; (technical) specification
under (guidance, supervision, rules, the law, etc.); under (a flag, the sun, etc.); beneath; with (e.g. one blow); on (the promise, condition, assumption, etc. that ...); (someone's) side
credit; money owed on an account; bill; hanger; holder; in the process of (doing); midway through
comparatively; relatively; fairly; considering ...; for ...; despite ...
to need; to call for; to require
desirable; hoped for; preferable; advisable