tap off
To let some liquid out through a tap, or to touch your travel card on a reader when you leave the bus or train.
Meanings
To draw off a portion of liquid or gas from a larger supply through a tap or valve.
"The brewer tapped off a sample from the barrel to check the flavour."
To check out of a public transport system by touching a payment card or device on a reader when leaving.
"Don't forget to tap off when you get off the bus or you'll be charged the maximum fare."
The liquid sense is technical/industrial, referring to controlled removal of liquid or gas. The transit sense ('tap off') is common in countries with contactless public transport systems (UK, Australia, Netherlands) and is the counterpart of 'tap on.'
Commonly used with
Forms
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