any time now; I wish something would happen
Rare literary expression used when hoping for something to occur, often with a sense of anticipation or wishful thinking. Not used in everyday conversation.
I wait impatiently for spring, hoping it will come any time now.
He was waiting for good news, hoping it would arrive any moment.
Variant spelling using 有れ for あれ; even less common.
The phrase combines 事 (こと, 'thing, event') with あれ (the imperative form of ある, 'to be') and かし (an archaic sentence-ending particle expressing hope or desire). The literal meaning is 'may there be an event', which evolved into an expression of hopeful waiting.