expression
I wish it were so; may it be so; I hope there is
Dated expression conveying a wish or hope for something to exist or be the case. Often used in classical or literary contexts; in modern Japanese, あればいいのに or similar constructions are more common.
昔の人は「雨あれかし」と願った。
People in the old days wished, 'May it rain.'
「平和あれかし」という言葉が石碑に刻まれている。
The words 'May there be peace' are carved on the monument.