שירות הלקוחות יכול לחסום את כרטיס החיוב.

This is a very common Hebrew structure called a construct chain (סמיכות).

• שירות = service
• הלקוחות = the customers

Together, שירות הלקוחות literally means the service of the customers, which is how Hebrew expresses the customer service department / customer service.

In a construct chain, Hebrew usually does not put ה־ on the first noun. The definiteness is often shown on the second noun, and that makes the whole phrase definite.

So:

• שירות לקוחות = customer service, customer-service in general
• שירות הלקוחות = the customer service, the customer service department

It is singular.

Even though הלקוחות is plural (the customers), the head of the phrase is שירות (service), and שירות is singular. So the whole subject is treated as singular.

That is why the sentence uses יכול and not יכולים.

Because יכול agrees with the subject in gender and number.

The subject is שירות הלקוחות, and the main noun שירות is:

• masculine
• singular

So the correct form is:

• יכול = can / is able to

Compare:

• היא יכולה = she can
• הם יכולים = they can
• החברה יכולה = the company can
• שירות הלקוחות יכול = customer service can

In sentences like this, יכול functions like a modal expression meaning can / be able to.

Hebrew often forms this idea with:

subject + יכול/יכולה/יכולים/יכולות + infinitive

So:

• שירות הלקוחות יכול לחסום = customer service can block
• אני יכול לעזור = I can help
• היא יכולה לבוא = she can come

So even if learners think of can as a separate modal verb in English, in Hebrew the pattern is a bit different: יכול changes to match the subject, and then it is followed by an infinitive.

לחסום is the infinitive, meaning to block.

The ל־ at the beginning is the normal marker for many Hebrew infinitives, so:

• לחסום = to block
• לעזור = to help
• לבוא = to come

In this sentence:

• יכול לחסום = can block / is able to block

The root of לחסום is related to the idea of blocking or obstructing.

את is the direct object marker. It does not have a direct English equivalent.

Hebrew uses את before a definite direct object, especially when the object is something specific, like the debit card.

So here:

• את כרטיס החיוב = the direct object, the debit card

You can think of it as a signal that says, the next word is the specific thing being acted on.

Compare:

• הוא קרא ספר = he read a book
• הוא קרא את הספר = he read the book

In your sentence, the object is definite, so את is required in standard Hebrew.

Again, this is a construct chain.

• כרטיס = card
• החיוב = the debit / the charge

Together:

• כרטיס החיוב = the debit card

In this pattern, the first noun usually does not take ה־. The definiteness appears on the second noun, and that makes the whole phrase definite.

So:

• כרטיס חיוב = a debit card / debit card in general
• כרטיס החיוב = the debit card

That is why הכרטיס החיוב would sound wrong in standard Hebrew.

חיוב literally means something like charge, billing, or debit, depending on context.

In financial language, it is connected to money being charged or debited. So כרטיס חיוב is a financial card associated with debit/charging.

In this sentence, the phrase refers to the debit card. The exact English term can depend on context, but the core idea of חיוב is charging/debiting.

The word order here is:

Subject + modal expression + infinitive + direct object

So:

• שירות הלקוחות = subject
• יכול = can
• לחסום = to block
• את כרטיס החיוב = the debit card

This is very similar to English:

• Customer service can block the debit card.

Hebrew can sometimes be flexible with word order, but this sentence is a very normal, straightforward structure.

It can sometimes cover both ideas, depending on context.

So יכול may mean:

• is able to
• can
• sometimes is allowed to, if the situation is about permission or authorization

In this sentence, because the subject is customer service, the meaning is probably something like:

• customer service is able to block the debit card
• or customer service has the authority to block the debit card

Context tells you which nuance is strongest.

A reasonable pronunciation guide is:

sherut ha-lakokhot yakhol lakhsom et kartis ha-khiyuv

Very roughly by parts:

• שירות = she-ROOT / she-RUT
• הלקוחות = ha-la-ko-KHOT
• יכול = ya-KHOL
• לחסום = lakh-SOM
• את = et
• כרטיס = kar-TIS
• החיוב = ha-khi-YUV

A few pronunciation notes:

• kh represents the Hebrew sound of ח/כ without dagesh, like the ch in German Bach
• Stress is often toward the end of the word in modern Hebrew

So the whole sentence sounds approximately like:

she-RUT ha-la-ko-KHOT ya-KHOL lakh-SOM et kar-TIS ha-khi-YUV