Slow sth up Meaning, Examples & How to Use the Phrasal Verb

What Does “Slow sth up” Mean?

“Slow sth up” means to make something move, progress, or happen more slowly than before.

Introduction

The phrasal verb “slow sth up” is commonly used in English to describe the action of reducing the speed or rate of a process, movement, or activity. When you slow something up, you cause it to become slower or less efficient. This can refer to physical movement, like traffic or machines, or to more abstract things, such as work progress or decision-making. Understanding the slow sth up meaning helps you communicate clearly when discussing delays or obstacles in various situations. It’s a useful phrase to add variety to your speech and writing, especially when explaining why something takes longer than expected.

Quick Info Box

• Phrasal verb: slow something up
• Type: transitive
• Level: B2
• Short meaning: to make something happen more slowly

Structure (Grammar Rules)

“Slow sth up” is a separable phrasal verb, which means you can place the object between “slow” and “up,” or after “up.”

• Slow + object + up (e.g., slow the process up)
• Slow up + object (e.g., slow up the traffic)

Both structures are correct, but the first is more common in everyday speech.

How to Use Slow sth up?

Use “slow sth up” when you want to describe something that is being delayed or made slower by a specific cause. It often refers to situations involving processes, machines, or movement. You can use it in both formal and informal contexts.

For example, if a machine is not working well, you might say it’s slowing the production up. Or if traffic is heavy, it can slow the flow of cars up. It’s important to include the object to clarify what exactly is being slowed.

Examples

Traffic jams often slow things up during rush hour.

The new regulations have slowed the approval process up significantly.

• The construction work is slowing the traffic up on Main Street.
• Technical difficulties slowed the project up by several weeks.
• Don’t let small problems slow you up when you’re trying to finish on time.

These examples show slow sth up in a sentence with different contexts.

Common Mistakes

People sometimes confuse “slow sth up” with “slow down.” Here are examples to help:

• Incorrect: The traffic slow up because of the accident.
• Correct: The traffic slowed up because of the accident.
• Incorrect: They slow up the work every day. (without object)
• Correct: They slow the work up every day.

Remember, “slow sth up” needs an object and the verb must agree with the subject tense.

Differences / Synonyms

“Slow sth up” is similar to “slow down,” but they are used differently. “Slow down” is often intransitive and focuses on the subject itself becoming slower.

• Slow sth up: Causes something else to become slower. (transitive)
  Example: The rain slowed the game up.
• Slow down: Something moves or happens more slowly by itself. (intransitive)
  Example: The car slowed down near the stop sign.

Other synonyms include “hold up” or “delay,” but these can have slightly different meanings or tones.

Common Collocations

When using “slow sth up,” certain nouns frequently appear as objects. These collocations help you sound natural.

• Traffic – slowing the movement of vehicles
• Process – making a procedure take longer
• Work – delaying tasks or jobs
• Production – reducing the speed of making goods
• Progress – causing delays in advancement

Related Phrasal Verbs

Here are related phrasal verbs of slow sth up:

• Slow Sth Down
• Slow Sb Up
• Slow Sb Down

Real-life Dialogue

Here is a short conversation using “slow sth up” naturally.

Anna: Why is the project taking so long?

Mark: The new software bugs are slowing the work up a lot.

Anna: Can the team fix it quickly?

Mark: They’re trying, but it’s definitely slowing things up right now.

Practice

Complete the sentences with the correct form of “slow sth up.”

• The heavy rain _________ the traffic _________ on the highway.
• Technical problems often _________ the production _________ in factories.
• Don’t let small issues _________ you _________ when working.

FAQ

• What does “slow sth up” mean?

  It means to make something happen more slowly or delay it.
• Is “slow sth up” separable?

  Yes, you can put the object between “slow” and “up” or after “up.”

• Can I say “slow down” instead of “slow sth up”?

  “Slow down” is usually intransitive and means the subject moves slower by itself. “Slow sth up” needs an object.
• What level is “slow sth up” suitable for?

  It is best for intermediate learners, around B2 level.

• Can “slow sth up” be used in formal writing?

  Yes, especially when describing delays or reduced speed in processes.