Boundary vs That's my __ limit

When to use each in English, with meaning, register, and examples.

Boundary

Top 1,000 (very common)C1noun

That's my __ limit

Top 5,000 (fairly common)
Most common: Boundary
 BoundaryThat's my __ limit
Pronunciation🇬🇧 /["/ˈbaʊndri/"]/🇺🇸 /["/ˈbaʊndri/"]/🇬🇧 //ðæts maɪ ˈlɪmɪt//🇺🇸 //ðæts maɪ ˈlɪmɪt//
MeaningA line that separates two areas or limits.The most you can handle or endure.
ExampleThe boundary between the two countries is marked by a river.After a long day at work, I just said, 'That's my limit!'
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 5,000 (fairly common)
CEFR levelC1-
Part of speechnoun
Collocationscommon, northern, southern, have, form, mark, fence, hedge, line, across the boundary, over the boundary, along the boundaryset a limit, personal limit, reach a limit, push the limit, exceed a limit
Antonymslimitless, unbounded-
Common mistakesConfused with 'boundaries' — learners often forget the plural form., Using 'boundary' in contexts where 'limit' or 'border' is more appropriate., Mixing up the concept with 'barrier', which refers more to an obstruction.Using 'limits' instead of 'limit' when referring to a single boundary., Confusing it with 'That's my final limit,' which can sound redundant., Forgetting to capitalize 'That's' at the beginning of a sentence.
Usage notesUse 'boundary' when discussing physical borders or limits in contexts like geography, relationships, or rules. Avoid using it in very casual conversations.This phrase is commonly used in conversations about personal boundaries, stress, or situations where someone feels overwhelmed. It can be used in both casual and serious contexts.

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Boundary
That's my __ limit

Frequently asked questions: Boundary vs That's my __ limit

What's the difference between Boundary and That's my __ limit?

Boundary: A line that separates two areas or limits. That's my __ limit: The most you can handle or endure.

Which is more common: Boundary and That's my __ limit?

Boundary is the most common in everyday English.

Can you show an example of each?

Boundary: The boundary between the two countries is marked by a river. That's my __ limit: After a long day at work, I just said, 'That's my limit!'

Can I use Boundary and That's my __ limit interchangeably?

Not always. Boundary and That's my __ limit are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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