tap on
To touch something lightly a few times — like knocking gently on a door or touching your card on a bus reader.
Meanings
To lightly and quickly touch a surface or object, usually with a finger, to attract attention or produce a sound.
"She tapped on the window to get the children's attention."
To check in to a public transport system by touching a payment card or device on a reader.
"You need to tap on with your card before the bus doors close."
The physical sense is very basic and common. The transit sense is used in countries with contactless payment systems. Both senses involve a light contact with a surface. 'Tap on the shoulder' is a classic idiom for getting someone's attention.
Commonly used with
Forms
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