
schleichen
to sneak
To move quietly, slowly, and carefully in order not to be heard or seen.
Der Einbrecher schlich durch die dunkle Wohnung.
The burglar sneaked through the dark apartment.
to sneak
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to sneak
To move quietly, slowly, and carefully in order not to be heard or seen.
Der Einbrecher schlich durch die dunkle Wohnung.
The burglar sneaked through the dark apartment.

to creep in
To arise, enter, or spread slowly and unnoticed. Often refers to mistakes, habits, or feelings.
Trotz sorgfältiger Prüfung haben sich einige Fehler in den Bericht geschlichen.
Despite careful checking, a few errors crept into the report.

to clear off
(colloquial, often derogatory) To leave, disappear. Often used as a rude command ('Schleich dich!' — clear off!).
Der Türsteher sagte ihm, er solle sich schleichen und nicht wiederkommen.
The bouncer told him to clear off and not come back.
Pay attention to the auxiliary verb in the perfect tense! For movement from A to B, 'sein' (to be) is used. With the reflexive forms, 'haben' (to have) is used.
Die Katze ist leise ins Zimmer geschlichen.
The cat sneaked quietly into the room.
The verb is used without a reflexive pronoun only in the basic meaning 'to move quietly'. When it means that something happens unnoticed or that someone should disappear, it is reflexive ('sich schleichen').
Er schlich auf Zehenspitzen aus dem Raum.
He sneaked out of the room on tiptoe.
In this figurative meaning, 'sich schleichen' (to creep in) is often used for abstract, negative things. Typical phrases are 'Fehler schleichen sich ein' (errors creep in), 'Zweifel schleichen sich ein' (doubts creep in), or 'eine Gewohnheit schleicht sich ein' (a habit creeps in).
Obwohl er es nicht wollte, schlich sich die alte Gewohnheit wieder ein.
Although he did not want it to, the old habit crept back in.
In this meaning, the verb is very colloquial and often rude. The command 'Schleich dich!' is a very direct and rude way to say 'Go away!'
Als er merkte, dass er unerwünscht war, schlich er sich von der Party.
When he realized he was not wanted, he slipped away from the party.
to disappear
Verschwinden and sich schleichen can both serve as rude commands to leave. “Verschwinde!” is a direct, dismissive order. “Schleich dich!” additionally sounds derogatory or contemptuous and also suggests that the person should leave inconspicuously.

Der Besitzer zischte dem Eindringling verächtlich zu: „Schleich dich!“
The owner hissed contemptuously at the intruder, “Clear off!”
Der Besitzer befahl dem Eindringling: „Verschwinde sofort!“
The owner ordered the intruder, “Get lost immediately!”