
schneiden
to cut
To divide or work on something with a sharp object such as a knife or scissors.
Er schneidet das Gemüse für den Salat.
He is cutting the vegetables for the salad.
to cut
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to cut
To divide or work on something with a sharp object such as a knife or scissors.
Er schneidet das Gemüse für den Salat.
He is cutting the vegetables for the salad.

to cut oneself
To accidentally wound oneself with a sharp object.
Ich habe mich beim Rasieren geschnitten.
I cut myself while shaving.

to cut
To shorten or shape a person's hair.
Der Friseur hat mir die Haare zu kurz geschnitten.
The hairdresser cut my hair too short.

to edit
To edit film or audio material by selecting, arranging, and joining parts together.
Es dauert oft Wochen, einen ganzen Spielfilm zu schneiden.
It often takes weeks to edit an entire feature film.

to snub someone
To intentionally ignore a person and act as if you do not see or know them.
Seit unserem Streit schneidet sie mich auf der Straße.
Since our argument, she has been snubbing me on the street.

to intersect
In geometry: when two or more lines or surfaces meet and cross at a point or along a line.
Die beiden Geraden schneiden sich im Koordinatenursprung.
The two straight lines intersect at the origin of the coordinate system.

to make a face
To twist one's face in a funny or ugly way.
Das Kind streckte die Zunge heraus und schnitt eine Grimasse.
The child stuck out his tongue and made a face.
Using 'schneiden' with or without a reflexive pronoun changes the meaning. 'Etwas schneiden' means to cut an object into pieces. 'Sich schneiden' means to accidentally injure oneself.
Bitte schneide die Zwiebel in kleine Würfel.
Please cut the onion into small cubes.
To describe how something is cut, you often use a prepositional construction. Typical patterns are 'in Scheiben schneiden' (to cut into slices), 'in Würfel schneiden' (to cut into cubes), or 'in Stücke schneiden' (to cut into pieces).
Für das Gratin müssen wir die Kartoffeln in dünne Scheiben schneiden.
For the gratin, we have to cut the potatoes into thin slices.
When you cut yourself on a specific body part, that body part is often given with 'in' + accusative. The reflexive pronoun then appears in the dative.
Ich habe mich geschnitten.
I cut myself.
When you cut someone's hair, the person whose hair is being cut is in the dative. The direct object is 'die Haare' (the hair).
Kannst du mir bitte die Haare schneiden?
Can you cut my hair, please?
In combination with words like 'Film' (film), 'Video' (video), or 'Ton' (audio/sound), 'schneiden' always means 'to edit' or 'to cut' media.
Die Regisseurin schneidet ihren neuen Film gerade selbst.
The director is currently editing her new film herself.
In the meaning 'to ignore someone', the verb is transitive and needs a person as a direct accusative object. It describes an active, deliberate action.
Nach unserem Streit schneidet er mich komplett.
After our argument, he is completely snubbing me.
The reflexive form 'sich schneiden' is used in mathematics and geometry to describe the point of intersection of lines or surfaces.
Zwei parallele Linien schneiden sich nie.
Two parallel lines never intersect.
The verb 'schneiden' is part of the fixed expression 'eine Grimasse schneiden' (to make a face). Here it has nothing to do with cutting something into pieces, but means 'machen' (to make) or 'ziehen' (to pull).
Der Clown schnitt eine lustige Grimasse, um die Kinder zum Lachen zu bringen.
The clown made a funny face to make the children laugh.
to ignore
Both verbs can mean deliberately paying no attention to someone. „Jemanden schneiden“ specifically refers to deliberately snubbing someone socially, as if you did not recognize the person, while „ignorieren“ is more general. „Schneiden“ is therefore often appropriate when demonstratively avoiding someone you know.

Auf der Feier schnitt er seinen früheren Freund und sah demonstrativ weg.
At the party, he snubbed his former friend and demonstratively looked away.
Während der Diskussion ignorierte sie den Hinweis ihres Kollegen.
During the discussion, she ignored her colleague's suggestion.