tap on
verbe- To strike an object or a person lightly and swiftly.
- To initiate an electronic ticketing process at the start of a public transport journey by holding a chipcard or a mobile device close to a terminal or reader
Dans la bibliothèque
He tiptoed along the hall and stood for several minutes outside the door of the east gable before he summoned courage to tap on it with his fingers and then open the door to peep in.
I was hesitating as to what I should do when there was a sharp tap on my shoulder, and there was Colonel Emsworth beside me.
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