一

unity of body and spirit

(when) danger threatens; should an emergency occur

Mathematics

one-to-one correspondence

great sensation; taking something by storm; making a splash

sole agency

to have in common (with)

to sing a tune

every moment is precious; time is money; precious time

general incorporated foundation

(people) working together with one mind

complete set of household goods

careful selection

Astronomy

Monoceros (constellation); the Unicorn

quick bath; quick shower; quick dip (e.g. in the sea)

Linguistics

general verbs

gaining some and losing some; (something having its) advantages and disadvantages

Mathematics

linear function

Idiomatic expression

small fraction (of); drop in the bucket; drop in the ocean

Military

master sergeant (JGSDF)

Proverb

one should be satisfied without desiring more wealth and rank than necessary; waking, half a tatami mat; sleeping, a single tatami mat

first off; first thing

women in general

beating of a drum as a signal to announce the opening (beginning) of an event (theatrical performance, festival, etc.)

the pace of change makes ten years back seem like ancient history