block off

phrasal verb·2 senses·particle off

Meanings

1

Close off an area or route to prevent access

Why “off”? A piece detaches from the whole. Contact with the body is broken.

Police blocked off the street.
Police closed the street to prevent access.
Fallen rocks blocked off the path.
Fallen rocks closed the path so people could not pass.
2

Reserve a period of time for a specific purpose

Separationuncommon
I've blocked off Friday for writing.
I've reserved Friday entirely for writing.
She blocked off the morning for calls.
She reserved the morning for calls.

Don't confuse with

block offblock out

Block off means close off an area or route to prevent access. Block out means stop light, noise, or a thought from reaching you.

Test yourself

Police blocked off the street. What does it mean?

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