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天井 てんじょう知 しらっとく
tenjō shira' toku

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Noun
, 
na-Adjective
, 
no-Adjective
, 
Aspectual Auxiliary

Preparatory: doing something in advance or leaving it done of 天井知らず

1. Ceiling knowledge.; Knowing your limits.

Preparatory Aspect
, 
Colloquial

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天井知らっとく

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