noun:

• useless book learning; knowing the theory but being able to put it into practice; practising swimming on a tatami mat [literal] - idiom - humorous term

expression / godan ~す verb:

• to put into effect; to put into practice

ichidan verb:

• to make a habit of; to make it a practice to

expression / godan -いく／-ゆく verb (spec.):

• to do for real; to do in real life; to carry (a story) into actual practice

noun:

• practice (as opposed to theory); actual practice
• actual site; (at) the scene; (on) the spot

noun:

• real sword (as opposed to a wooden practice sword)

expression / godan ~る verb:

• to become experienced (after many years of practice)

noun:

• thousand-day walk through the mountains from Hieizan to the old Imperial Palace in Kyoto (ascetic practice of the Tendai sect) - Buddhism term

noun:

• setting off the night before one normally would have departed, travelling in a different direction, spending the night there, and leaving for one's destination in the morning (done to avoid travelling in an unlucky direction; a common practice during the Heian period) - archaism ➜ 方塞がり・方違へ所

noun:

• setting off the night before one normally would have departed, travelling in a different direction, spending the night there, and leaving for one's destination in the morning (done to avoid travelling in an unlucky direction; a common practice during the Heian period) - archaism ➜ 方塞がり

godan ~る verb / intransitive verb:

• to rot; to go bad; to decay; to spoil; to fester; to decompose; to turn sour (e.g. milk)
• to corrode; to weather; to crumble
• to become useless; to blunt; to weaken (from lack of practice)
• to become depraved; to be degenerate; to be morally bankrupt; to be corrupt
• to be depressed; to be dispirited; to feel discouraged; to feel down ➜ 気が腐る【きがくさる】

auxiliary verb / godan ~る verb:

• to have the audacity to; to be bastard enough to - after the -masu stem of a verb; indicates scorn or disdain for another's action - usually written using kana alone - Kansai dialect ➜ やがる

godan ~る verb / intransitive verb:

• to lose a bet - archaism
• to be drenched; to become sopping wet - archaism

adjectival noun:

• serious; earnest

noun:

• real sword (as opposed to unsharpened or wooden practice weapon)

expression / ~する verb (irregular):

• to decide to
• to pretend that - after the past tense form of a verb
• to make a practice of doing; to make it a rule to - as 〜ことにしている