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creep in

B1 neutral inseparable intransitive
In simple words

To slowly move into a place or situation without anyone noticing, like a mistake quietly appearing in your work.

Literal meaning: To creep means to move very slowly and quietly; 'in' means entering a space — someone or something slowly entering without being detected.

Meanings

1 A2 neutral

For a person or animal to enter a place quietly and slowly, trying not to be noticed.

"She tried not to wake anyone as she crept in after midnight."

Grammar: inseparable
2 B1 idiomatic neutral

For something abstract (an error, a doubt, a habit) to gradually appear or develop without being immediately noticed.

"A few typos crept in during the final editing stage and made it to print."

Grammar: inseparable
3 B1 idiomatic neutral

For an unwanted feeling or influence to slowly begin to affect a situation.

"A sense of doubt began to creep in as the project continued to fall behind."

Grammar: inseparable
Usage notes

Frequently used figuratively for abstract things like errors, doubts, fatigue, or bad habits. Also used literally for people or animals moving quietly into a space. Common in both British and American English.

Commonly used with

errors doubt fatigue habits changes influence

Forms

Base
creep in
I/you/we/they
3rd person
creeps in
he/she/it
Past simple
creeped in
yesterday
Past participle
creeped in
have + pp
-ing form
creeping in
continuous

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