To blow a kiss is to kiss your hand and send it towards somebody. Blow a kiss from the window.
It works across distance, which is why it belongs to platforms and departures. To blow a kiss to a child is affectionate and to blow a kiss to an audience is theatrical.
1phraseblow a kissTo kiss your hand and send it towards somebody.
“She would blow a kiss from the top of the steps every morning.”
blow a kiss is a gesture.
Practised in Body Language & Gestures