It's just a tiny vibration, not unlike the attack note on the E-string.

They become extra sensitive to tiny vibrations made by sounds and can almost 'hear through their feet'.

A soft thud, a long way off, sent a tiny vibration through the old building.

During his presentation he had felt a tug at the web, just a tiny vibration.

The tiny vibration which was the only discernible sign of its correct working.

Just a few tiny vibrations at first, then more.

A tiny vibration and a soft meow attracted her attention.

The room was trembling, a tiny vibration in all the walls and the rock below.

There was a tiny vibration which only a trained man would notice.

A radar system measures the tiny vibrations on the surface as the waves pass by.