lui lasciasse

left, let, allowed

→ lasciare
lasci to leave, to depart from + asse Imperfect subjunctive, 3rd person singular
verb · 3rd-person singular, imperfect tense Rare #43,209
left Used in the subjunctive; can mean “would leave” depending on context.
IT: Speravo che lasciasse un messaggio.
EN: I hoped she would leave a message.
let, allowed Used in the subjunctive; can mean “would let” depending on context.
IT: Volevo che mi lasciasse parlare.
EN: I wanted her to let me speak.
Conjugation of lasciare

Feci scomparire la mia auto senza che lasciasse traccia.

I made my car disappear without a trace.

— Contrattempo (2017)

Voleva che lasciasse il suo lavoro.

He wanted her to quit her job.

Mary voleva che sua madre la lasciasse da sola.

Mary wanted her mother to leave her alone.

Le chiesi che mi lasciasse un indirizzo di dove andasse.

I asked her to leave me an address of where she was going.

— Still Life (2006)