A thought, a word, a breath or a step?

When asked what love was,
I answered in truth,
A sweetly simple melody,
As charming as a youth.

But not always said,
A wish on the mind,
A collection of words that
Form a thought for some time.

Or maybe you're brave,
So that means it's there,
Expressed in four letters
And said out in the air

Maybe it's simple,
Not shirt, suit and tie,
A breath on your neck,
The breath when you fly.

It could be a step,
A jump or a slide,
Sort of said silently,
To make your heart glide.