nán​yǐ​qǐ​chǐ

to find it hard to speak about something

难以启齿 難以啟齒 nán​yǐ​qǐ​chǐ
to find it hard to speak about something
to be too embarrassed or ashamed to mention something; to find it hard to speak one's mind

Frequency

Movie subtitles
2.24 per million appears in 1% of films
Written text
0.590 per million

Sources