godan ~く verb:

• to drop a few lines

noun:

• doing a good deed each day; doing one good turn a day - four character idiom

noun:

• hitoegusa (Monostroma nitidum)

noun:

• an annual (plant)

noun:

• public highway; local street; open road; ordinary road

noun:

• one field; a division; a branch (e.g. of study, etc.)

noun:

• (being beholden to someone for a favor of) a night's lodging and a meal - four character idiom

noun:

• one jump; one flight ➜ 一飛び
• (at) once; (in) one stroke ➜ 一飛び

noun:

• primary cosmic rays

expression:

• there's but a fine line between genius and insanity - proverb

noun:

• dance performed by a single person

interjection:

• (can you) spare a little time (to speak)?; (do you) have a moment (to speak)?

noun:

• set of three ➜ 三幅対

noun:

• uniformity; integrity

noun:

• class A river; specified waterways of special importance protected by the government

noun:

• doing a job; riding and sweating up a horse

adverbial noun / temporal noun:

• after one out - Baseball term

noun:

• one boat; one ship

noun:

• gaining some and losing some; (something having its) advantages and disadvantages - four character idiom

noun / ~の noun:

• guiding principle; single-minded policy - idiom
• one's sole talent - idiom

noun:

• single spear ➜ 槍【やり】

expression / adjective:

• cloudless (sky); without a cloud (in the sky)

expression:

• any port will do in a storm; when you've lost your boat midstream, even a pot is worth a fortune [literal] - proverb

noun:

• first knuckle joint

noun:

• the dots of i's and the crosses of t's; (not neglecting) the slightest details - four character idiom ➜ 一点一画もおろそかにしない

noun:

• bull's-eye