碍口识羞

tongue-tied for fear of embarrassment (idiom)

to hinder / to obstruct / to block

to shy to speak out / tongue-tied / to hesitate / too embarrassing for words

mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls

to know / knowledge / Taiwan pr. [shi4]

to record / to write a footnote

to know shame / to feel shame (often with a negative, shameless)

shy / ashamed / shame / bashful / variant of 饈|馐[xiu1] / delicacies