verb
to amuse, to have fun
B1
Amüsieren primarily means 'to amuse' (to entertain someone) and reflexively as sich amüsieren 'to have fun' or 'enjoy oneself'. It's a regular weak verb with perfect participle amüsiert and uses haben as auxiliary. Can be used both reflexively (sich amüsieren) and non‑reflexively to mean amusing someone.
Examples
Wir amüsierten uns prächtig.
We had a splendid time.
Ich amüsiere mich gut.
I'm having a good time.
Der Clown kann die Kinder amüsieren.
The clown can amuse the children.
Details
Mnemonics
Picture a clown making people laugh — they are being amused.
Like English 'amuse' — 'amüsieren' sounds very similar.
Notes
amüsieren is often used reflexively (sich amüsieren = to have fun/enjoy oneself) but can be transitive (jemanden amüsieren = to amuse someone).