at any moment; on the verge of; just about to
Describes an imminent action or event that seems about to happen right now. Often used with verbs in the potential or non-past form, and carries a sense of urgency or expectation.
It looks like it's going to start raining at any moment.
He had a face that looked like he was about to burst into tears.
It looks like it could start raining any moment now.
She twisted her face as if she were about to burst into tears at any moment.
The bus was just about to leave.