limestone cave; limestone cavern
laboratory animal; experimental animal
an extremely great number (often said to be 100 million); 10^60 (or 10^72)
first half of the year; first half of the fiscal year
rank; place (e.g. first place); decimal place; counter for ghosts
cruel; brutal; savage; barbarous
cheerfully; joyously; joyfully; happily; lightheartedly; excitedly
saying something (to someone); greeting; approaching (someone)
sea cucumber (Holothuroidea spp.)
aquatic life; water creatures
to slip out; to steal out; to excel; to stand out
fluorescent lamp; fluorescent light; person who is slow to react; someone slow on the uptake
absolutely every little bit; everything from A to Z; systematically; thoroughly; one after another; successively
enemy encounter; encounter (with); running into; coming across
model; (good) example; exemplar; paragon
ratio; proportion; match; equal; compared with ...; relative to ...
mobile game (esp. online, free-to-play); social network game
protagonist; main character; hero; head (of a household); proprietor (of a store)
command; direction; supervision; conducting (an orchestra, choir, etc.)
capsule toy; vending machine toy; gacha; loot box; lottery (i.e. something decided by chance)
righteous government; just rule; easy method; simple approach; orthodox way; proper way
service station; gas station; shortstop; sporty sedan; steamship; SS; Secret Service (US)
to mesh (of gears, cogs, etc.); to engage with each other; to bite each other; to be on the same wavelength; to mesh
bridal costume; wedding dress
athletic meet (esp. at a school); sports day; field day; sports festival
to fit; to get into; to be fit for (a job, etc.); to be suited for; to fall into; to plunge into
riot; rebellion; (media) uproar; brouhaha; feud; tussle
prison guard; warder; jailer; gaoler
wearing (e.g. a uniform, seat belt, helmet); having on
whip; lash; stick; cane; encouragement; rebuke
useless; worthless; half-man (esp. upper body); (arch.) half day (e.g. when working)
presumption; assumption; estimation