Vocabulary

backup boyfriend; man kept as a backup marriage partner

syncretism (in ancient Chinese philosophy); syncretist

Software as a Service; SaaS; on-demand software

self-study book; self-study manual; crib

footrest; footstool

screamer bomb; sound bomb

retweet

destroying a country

arrowroot

effectiveness of time spent; value of something compared to the time it requires

schwa

acoustic weapon; sonic weapon

fresh juice (esp. freshly squeezed)

first house-cleaning of the year (on January 2); first sweeping

merits and demerits; pros and cons; advantages and disadvantages

mandarin fish (Siniperca chuatsi); Chinese perch

conversion candidate (in an input method editor)

(crime of) opening sealed correspondence

wheelchair rugby

horse trailer; horse van

wearing a face mask solely to avoid upsetting others (during the COVID-19 pandemic); wearing a mask to not stand out

coracobrachialis muscle

taking turns reading out loud

(crime of) opening sealed correspondence

wheelchair basketball

heritage language

resignation under instruction; resigning as advised

tripletail (Lobotes surinamensis)

having completed no schooling beyond elementary school; elementary school graduate

director of Dewa province

four-eyes; four-eyed bastard

magic stone (in fiction)

best of the best; the very best

chief court musician (ritsuryō system)

first assistant court musician (ritsuryō system)

second assistant court musician (ritsuryō system)

alternate assistant court musician (ritsuryō system)

chief court physician (ritsuryō system)

short pasta; short pasta cuts

hopper crystal; skeleton crystal