牢关 (牢關) láoguān

láoguān set phrase a barrier that cannot be penetrated
Domain: Buddhism 佛教 , Subdomain: Chan School
Notes: Quote: a phrase used in Chan literature, for example, in the No. 9 Koan in 碧巖錄 ”The Blue Cliff Record”; referring to a difficult problem or task (retranslated from Ch’ung-hsien, K’o-ch’in, and Thomas F. Cleary trans. 1998, p. 56; FGDB '牢關'; T 2003, Scroll 1)

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