Usage Note
Infittire is used both transitively (la nebbia infittisce il traffico = the fog thickens traffic) and intransitively/reflexively (il bosco si infittisce = the wood becomes denser). It conjugates as a regular -ire verb in the -isc- group: infittisco, infittisci, infittisce. The auxiliary in compound tenses is essere when intransitive.
Examples
"La nebbia cominciò a infittirsi."
Natural Translation
The fog began to thicken.
Related Words
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