Onceyouclick it, you can then swipe your finger across any text area to look up definition or translation, and you can choose your desired target language in the app's settings.
If you forget even once to enable your protections, or click on the wrong link, or type the wrong thing, and you've permanently attached your name to whatever anonymous service you're using.
Pesos will do as a medium of exchange, if you have no other choice, but once dollars are just a click away the peso doesn't stand a chance competitively.