
betätigen
to operate
To operate a switch, lever, button, or device in order to trigger a function.
Im Notfall müssen Sie den roten Knopf betätigen.
In an emergency, you must operate the red button.
to operate / be active
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to operate
To operate a switch, lever, button, or device in order to trigger a function.
Im Notfall müssen Sie den roten Knopf betätigen.
In an emergency, you must operate the red button.

to be active
To be active in a particular area or engage in an activity, often in a professional, athletic, or artistic context.
Sie betätigt sich seit vielen Jahren ehrenamtlich im Tierschutz.
She has been active as a volunteer in animal protection for many years.
The verb 'betätigen' is derived from the adjective 'tätig' (active). The prefix 'be-' and the ending '-igen' turn the adjective into a verb meaning 'to make active' or 'to be active'.
Durch das Betätigen des Schalters wird das Licht eingeschaltet.
Operating the switch turns on the light.
The meaning changes depending on whether the verb is reflexive or not. 'Etwas betätigen' means to operate a device. 'Sich betätigen' means to be active in a particular area.
Er betätigte den Alarmknopf.
He operated the alarm button.
In the meaning 'to operate', 'betätigen' is almost always used with technical devices. Typical objects are: a switch, a lever, a brake, or a button.
Der Pilot betätigte mehrere Hebel im Cockpit.
The pilot operated several levers in the cockpit.
The reflexive form 'sich betätigen' is often combined with adverbs that describe the area of activity, e.g. 'sich sportlich', 'künstlerisch', 'politisch', or 'ehrenamtlich betätigen' (to be active in sports, artistically, politically, or as a volunteer).
Mein Großvater betätigt sich auch im hohen Alter noch sportlich.
My grandfather is still active in sports even at an advanced age.
to press / hug
With a button or switch, both drücken and betätigen can be appropriate. Drücken focuses on the physical movement with the finger or hand. Betätigen emphasizes using the control and thereby triggering its function.

Der Techniker betätigt den roten Knopf, um die Maschine zu stoppen.
The technician operates the red button to stop the machine.
Der Techniker drückt den roten Knopf mit dem Finger.
The technician presses the red button with his finger.