行

Idiomatic expression

quick bath; hurried bath

letter of divorce

Medicine

epidemic

acting leader (usu. of a party)

model plane

banking

Common noun

diurnality; daytime activity

Nouns which may take the genitive case particle 'no'

diurnal

toll road ticket

pass (e.g. in public transportation)

blank line

prowling (without being noticed); patrolling in plain clothes

traveling in secret

surveillance flight

parallel bars

default on a debt

Common noun

frequency; popularity; currency

Noun or participle which takes the aux. verb suru

to perform well; to be successful in an activity

vertically segmented administrative system; overcompartmentalized bureaucracy; system in which interministerial rivalry diminishes overall efficiency; (bureaucratic) sectionalism; interministerial rivalry; bureaucratic fiefdoms

boating; sailing; navigation

Geometry

parallelogram

Slang

sexual intercourse (esp. with a prostitute); actual sex (in movies, etc.)

local administration

travel guide; guidebook

inconsistency between one's words and actions; insincerity; saying one thing and doing another

driving on the right-hand side; driving on the right side of the road

to popularize; to popularise; to give currency to; to set a trend

the "wa" column of the Japanese syllabary table (wa, wi, we, wo)