lui partisse

left, was leaving

→ partire
part to leave, to depart + iss imperfect subjunctive + e third-person singular imperfect subjunctive
verb · third singular · imperfect subjunctive Rare #41,437
left, was leaving Imperfect subjunctive of "partire"; often used after past expressions like "pensavo che...".
IT: Pensavo che partisse alle otto.
EN: I thought he was leaving at eight.
Conjugation of partire
Subjunctive imperfect
SingularPlural
First partissi
Second partissi
Third partisse

Non volevo che Tom partisse.

I didn't want Tom to leave.

Non voleva che partisse.

He didn't want her to leave.

Volevo che Tom partisse.

I wanted Tom to leave.

Era più sicuro nel caso lui ci fosse salito prima che lei partisse.

It was safer if he got in before she left.

— La fiamma del peccato (1944)