adverb taking the 'to' particle, adverb
Mimetic word for a light, short tapping or knocking sound, often used with と or as an adverb.
Someone tapped lightly on the door.
I heard a light knock on the door.
I was tapped on the shoulder.
Someone tapped me lightly on the shoulder from behind.
He gave a light poke with his finger to get my attention.
Mimetic word; the sound is imitative of a light tap or knock.