verb
annoy
A2
Means mainly 'to annoy' or 'to upset'; reflexively (sich ärgern) it means 'to be annoyed', non-reflexively (jemanden ärgern) 'to annoy someone'. Uses auxiliary haben, is regular (weak), and shows orthographic umlaut in 2nd/3rd person singular (ärgerst/ärgert). Not separable; no specific preposition required.
Examples
Die Verspätung hat ihn wirklich geärgert.
The delay really annoyed him.
Ich habe mich über dich geärgert.
I was annoyed with you.
Ich ärgere mich über das Wetter.
I'm annoyed about the weather.
Details
Mnemonics
picture someone frowning while another person teases them, saying 'Das ärgert mich!'
sounds like 'air-gurn' — imagine air making someone grumpy
Notes
Can be used reflexively (sich ärgern = to be annoyed) or transitively (jemanden ärgern = to annoy someone). Include both uses.