Meaning of “too” in the English Dictionary

"too" in British English

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tooadverb

uk /tuː/ us /tuː/

too adverb (MORE)

A1 more than is needed or wanted; more than is suitable or enough:

I'm too fat.
I can't reach the shelf - it's (a bit) too high.
There were (far) too many people for such a small room.
It's too hard (for me) to explain.
It was too expensive a desk for a child's room.
It's (all) too much (= more than I can deal with) - I can't stand it.
all too

used before an adjective or adverb to emphasize a negative meaning:

The holidays flew by all too quickly.
only too

used before an adjective to emphasize a positive meaning:

"Would you like to make a donation?" "I'd be only too pleased."

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too adverb (ALSO)

A1 (especially at the end of a sentence) in addition, also:

I'd like to come too.
informal "I love chocolate." "Me too."

used to show surprise:

It's a wonderful picture of light shining through trees - and by a child too!

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too adverb (VERY)

A2 very, or completely:

He wasn't too pleased/happy when I told him about the mistake.
My mother hasn't been too well recently.
formal Thank you, you're too kind.

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(Definition of “too” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"too" in American English

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too adverb [ not gradable ] (MORE)

more than is needed or wanted; more than is suitable or enough:

The sofa is too big for this room.
The apartment was nice but it was just too expensive.
This dress is too large for me – I’ll need a smaller size.

too adverb [ not gradable ] (VERY)

very, or completely:

I’m not too sure I want to go out tonight.

too adverb [ not gradable ] (ALSO)

(esp. at the end of a sentence) in addition; also:

Bring your tennis racket, and your bathing suit, too.

(Definition of “too” from the Cambridge Academic Content Dictionary © Cambridge University Press)