it'll
pron. A1 Beginner itll
pron. a short way of saying 'it will' or 'it shall'. You use it to talk about something that is going to happen in the future.
pron. a contraction of 'it will' (occasionally 'it shall'), used to express future events or predictions in informal speech and writing.
It'll be sunny tomorrow.
If you leave the ice cream on the counter, it'll melt within twenty minutes.
The technician promised that while the repair is expensive, it'll ensure the machine remains operational for another decade without further maintenance.
Usage
A contraction used primarily in speech and informal writing; avoid in formal academic or legal documents.