St Trin ‧ i ‧ an's /s ə nt ˈtrɪniənz $ seɪnt-/ BrE AmE
an imaginary British private school for girls in humorous ↑ cartoon stories of the 1950s and later in a number of humorous films. The girls are very badly behaved and the teachers cannot control them, and they have many amusing and exciting adventures, often involving illegal activities. ↑ schoolgirl s who behave badly are sometimes compared to the girls of St Trinian's.