Express appreciation for a dating profile, say

SWIPE

Think of the quick gesture you might make on a phone screen to show interest in someone’s online profile. It’s not a tap or a click, but a motion that moves left or right.

This clue plays on modern dating app culture where you "swipe right" to show interest in someone's profile. "Express appreciation" hints at a positive action, and "for a dating profile" points to apps like Tinder where swiping is the main way to react. The answer "SWIPE" fits because it’s the literal motion used to like or approve a profile. The "say" in the clue signals this is a common but not exclusive example.