Their acquaintance ripened into a deep friendship.

This acquaintance ripened into a true, artistic friendship, which lasted till Mr. Dodgson's death.

But in the torrid atmosphere of Paris, a nodding acquaintance ripens quickly to intimacy.

There were few formalities between this astute diplomat and the young king; those had passed gradually away as their acquaintance and friendship ripened.

But for all that, their acquaintance had not ripened into friendship.

She met Elizabeth Barrett Browning in 1836, and their acquaintance ripened into a warm friendship.

His acquaintance with Randal ripened rapidly into friendship.

I began my acquaintance with him that night, and during my long stay in Tahiti that acquaintance ripened into friendship.

Either he'd have to fetch the first-aid kit in a hurry, or this acquaintance was ripening faster than anticipated!

Their parents occupied adjoining houses; and neighborhood brought the young people together, and acquaintance ripened into love.