Wiktionary
arm-in-arm
a. (alternative form of arm in arm English)
Usage examples of "arm-in-arm".
It was Susan, his half sister, running slightly ahead of Philomena Toussaint and the Queen Mother, who were strolling arm-in-arm, enjoying the spring sunshine.
After that all the well people walked arm-in-arm up and down the long promenade deck, enjoying the fine summer mornings, and the seasick ones crawled out and propped themselves up in the lee of the paddle-boxes and ate their dismal tea and toast, and looked wretched.
The marriage would be performed discreetly, in her boudoir, and then the newlywed couple would descend the stairs arm-in-arm, to celebrate with their friends, all of whom could then diplomatically pretend that Father LcClerc was merely an eccentrically dressed wedding guest.