What Does “Block sth up” Mean?
“Block sth up” means to stop something from working or flowing by filling or obstructing it completely.
Introduction
The phrasal verb “block sth up” is commonly used in English to describe situations where something is clogged, stopped, or obstructed. For example, a pipe might be blocked up by dirt, or a road might be blocked up by traffic. Understanding the block sth up meaning helps learners describe everyday problems related to blockages or stoppages. This phrase is useful because it can refer to both physical blockages, like a sink, and abstract ones, like a schedule or communication. Knowing how to use “block sth up” correctly improves your ability to explain issues clearly and naturally in English.
Quick Info Box
- Phrasal verb: block something up
- Type: Transitive
- Level: B1 (Intermediate)
- Short meaning: To obstruct or clog something completely
Structure (Grammar Rules)
“Block sth up” is a transitive phrasal verb, which means it always needs an object (something that is blocked). It is separable, so you can say either:
- block something up
- block up something
Both forms are correct, but “block something up” is more common in everyday speech.
How to Use “Block sth up”?
Use “block sth up” when you want to say that an object or passage is being stopped or clogged. It often refers to pipes, drains, holes, or places where something normally flows or moves. You can also use it figuratively, such as blocking up a schedule or communication, but this is less common.
Example contexts include:
- Household problems (e.g., blocked sinks or toilets)
- Roads or entrances obstructed by objects
- Channels or pathways that are clogged or closed
Examples
- The leaves blocked up the drain after the storm.
- Don’t put too much paper in the printer; it might block it up.
- The traffic accident blocked up the highway for hours.
- Hair and soap often block up bathroom sinks.
- The children accidentally blocked up the garden hose with dirt.
Common Mistakes
- Incorrect: The drain block up after the rain.
Correct: The drain blocked up after the rain. - Incorrect: She blocked the up sink with hair.
Correct: She blocked up the sink with hair. - Incorrect: The road blocked up by the fallen tree.
Correct: The road was blocked up by the fallen tree.
Differences / Synonyms
Similar phrasal verbs include:
- Clog up: Very similar in meaning, often used for pipes and drains. Slightly more informal.
- Plug up: Means to fill or stop a hole or opening completely, often with something solid.
- Stop up: Means to block or close something, especially a hole or pipe.
Difference: “Block sth up” emphasizes obstruction or stopping flow. “Clog up” often implies a gradual build-up of something like dirt or hair. “Plug up” usually means filling a hole tightly. “Stop up” is more formal and less common in everyday speech.
Common Collocations
- Block up the drain
- Block up the sink
- Block up the pipe
- Block up the hole
- Block up the road
Related Phrasal Verbs
Here are related phrasal verbs of block sth up:
Real-life Dialogue
Anna: Why is the kitchen sink full of water?
Ben: I think the drain is blocked up again.
Anna: Oh no! Did you try using the plunger?
Ben: Yes, but it didn’t work. We might need a plumber.
Practice
Fill in the blanks with the correct form of “block up”:
- The leaves _______ the gutters during autumn.
- Be careful not to _______ the toilet with too much toilet paper.
- The fallen tree _______ the main road after the storm.
- Soap and hair often _______ the bathroom sink.
FAQs
- Q: Can “block sth up” be used in a figurative sense?
A: Yes, but it is mostly used for physical blockages. Figurative use is less common. - Q: Is “block sth up” formal or informal?
A: It is neutral and suitable for both formal and informal contexts. - Q: Can I say “block up the sink” or “block the sink up”?
A: Both are correct. “Block the sink up” is more common in everyday speech. - Q: What is the difference between “block sth up” and “clog up”?
A: “Clog up” usually refers to gradual build-up, while “block up” focuses on complete obstruction. - Q: Is “block sth up” separable or inseparable?
A: It is separable, so you can place the object between “block” and “up” or after “up.”

