Dalliance

noun/ˈdæli.əns/culture

Definition

A casual romantic or sexual relationship.

Etymology

From Middle English daliaunce et al., from dalien (“to exchange pleasantries, to chat; to flirt”), from Old French dalier, dailer. By surface analysis, dally +‎ -ance.

Synonyms

flirtation

In a sentence

His brief dalliance with day trading ended in predictable losses.