sǐ​dǎng

best friends

死党 (死黨) sǐ​dǎng
best friends noun
inseparable or extremely close friends

She is my best friend; we have no secrets from each other.

diehard followers noun
loyal members of a clique, faction, or criminal gang; henchmen

The crime boss has several loyal henchmen by his side.

Frequency

Movie subtitles
2.77 per million appears in 1% of films
Written text
2.45 per million

Sources

Definitions
CC-CEDICT