
lachen
to laugh
To express joy, amusement, or being entertained through facial expressions and sounds.
Der Witz war so gut, dass alle laut lachen mussten.
The joke was so good that everyone had to laugh out loud.
to laugh
Loading your saved state.

to laugh
To express joy, amusement, or being entertained through facial expressions and sounds.
Der Witz war so gut, dass alle laut lachen mussten.
The joke was so good that everyone had to laugh out loud.

to laugh at
To make fun of someone or something; to mock someone or something.
Es ist nicht nett, über die Fehler anderer zu lachen.
It's not nice to laugh at other people's mistakes.

to have nothing to laugh about
To be in a difficult, serious, or unpleasant situation.
Seit er seinen Job verloren hat, hat er wirklich nichts mehr zu lachen.
Since he lost his job, he really has had nothing to laugh about.
The verb 'lachen' (to laugh) is very often used with the preposition 'über' (about/at) and the accusative. This can mean that you find something funny or that you are making fun of someone.
Wir haben sehr über seinen Witz gelacht.
We laughed a lot at his joke.
To describe the type of laughter, 'lachen' (to laugh) is often combined with adverbs like 'laut' (loudly), 'herzlich' (heartily), or 'leise' (quietly). Colloquially, you also hear the expression 'sich kaputt lachen' (to laugh one's head off).
Sie hat so herzlich gelacht, dass alle mitlachen mussten.
She laughed so heartily that everyone had to laugh along.
When 'lachen über' (to laugh at) refers to a person or their mistakes, it often has a negative, mocking meaning. It then means to make fun of someone.
Die anderen Kinder haben über seine alte Jacke gelacht.
The other children laughed at his old jacket.
The idiom 'nichts zu lachen haben' (to have nothing to laugh about) is a fixed unit. It describes that a person is in a very serious or difficult life situation.
Mit drei kleinen Kindern und wenig Geld hat die Familie gerade nichts zu lachen.
With three small children and little money, the family currently has nothing to laugh about.
to smile
Lachen and lächeln both express joy, friendliness, or amusement. Lachen normally also involves audible sounds, while lächeln refers to a silent facial expression. Use lachen for an audible reaction and lächeln when the person is reacting only in a friendly or quiet way.

Als der Schauspieler den Witz erzählte, begannen alle laut zu lachen.
When the actor told the joke, everyone started laughing loudly.
Als der Schauspieler den Witz erzählte, musste sie nur leise lächeln.
When the actor told the joke, she could only smile quietly.