Ibu bilang cat lama mudah mengelupas kalau terkena air.

In Indonesian, cat is a completely different word from the English cat. Here, cat means paint.

A useful pronunciation note:

• cat (paint) is usually pronounced roughly like chat
• It is not pronounced like the English animal cat

So cat lama means old paint, not anything to do with an animal.

Ibu can mean:

• mother / mom
• Mrs. / ma’am
• a respectful way to address an adult woman

Without more context, Ibu bilang... could mean:

• Mother said...
• The lady / ma’am said...

If this is from a family context, it probably means Mom said... If it is from a general conversation, it could be the woman said...

Bilang is a very common, everyday way to say say / tell in Indonesian.

Comparison:

• bilang = informal, conversational, very common in speech
• mengatakan = more formal, more standard in writing
• berkata = to speak / to say, also more formal or literary

So Ibu bilang... sounds natural in everyday Indonesian, similar to Mom said... in English.

Indonesian often leaves out that when introducing a reported statement, just like English often does.

So:

• Ibu bilang cat lama mudah mengelupas... literally looks like
• Mother said old paint easily peels...

Natural English would often add that:

• Mother said that old paint peels easily...

But in Indonesian, leaving out bahwa (that) is very normal.

You could say:

• Ibu bilang bahwa cat lama mudah mengelupas...

But bahwa is often omitted in everyday speech.

Lama can mean different but related things depending on context:

• long (time)
• old / not new
• for a long time

In cat lama, it means old:

• cat lama = old paint

It does not mean long paint here. Indonesian words often depend heavily on context.

In Indonesian, modifiers usually come after the noun.

So:

• cat lama = old paint
• rumah besar = big house
• buku baru = new book

This is the opposite of English, where adjectives usually come before the noun.

So:

• English: old paint
• Indonesian: cat lama

Mudah means easy / easily.

Mengelupas means to peel off / to flake off, especially for surfaces like:

• paint
• skin
• coatings

So:

• mudah mengelupas = peels easily / is easy to peel off

In this sentence, it describes what old paint tends to do.

The base idea is related to kelupas, which has to do with peeling or coming off.

The prefix meng- often forms a verb, so:

• mengelupas = to peel off / to come off in flakes

In actual usage, mengelupas is the normal form you will often see for this meaning.

So mudah mengelupas is a natural way to say:

• peels easily
• comes off easily
• flakes off easily

Yes. Kalau here means if or when, depending on context.

In this sentence:

• kalau terkena air = if it gets exposed to water / when it gets wet

Kalau is very common in everyday Indonesian for conditional statements.

Other possible words:

• jika = if, more formal
• bila = if/when, also somewhat more formal

So kalau is the natural conversational choice.

Both kena air and terkena air can mean something like get hit by water / get wet / be exposed to water, but they feel a little different.

• kena air is common and conversational
• terkena air sounds a bit more formal or descriptive

Terkena often gives a sense that something is affected by or subjected to something.

So:

• kalau terkena air = if it is exposed to water
• kalau kena air = if it gets wet / if water gets on it

Both are understandable, but terkena air sounds slightly more polished.

The subject is understood from context: cat lama.

So the sentence means:

• Old paint peels easily if it gets exposed to water.

Indonesian often does not repeat pronouns like it when the subject is already clear.

Structure:

• Ibu bilang = Mother said
• cat lama = old paint
• mudah mengelupas = peels easily
• kalau terkena air = if exposed to water

The understood meaning is:

• Old paint peels easily if it is exposed to water.

Yes, in Indonesian, air means water.

This is another false friend for English speakers.

Pronunciation:

• Indonesian air is pronounced roughly like ah-eer or a-ir
• It does not mean English air

Examples:

• air minum = drinking water
• air panas = hot water
• terkena air = get wet / be exposed to water

A helpful breakdown is:

• Ibu bilang = Mother said
• cat lama = old paint
• mudah mengelupas = peels easily / is easy to peel off
• kalau terkena air = if exposed to water

So the whole structure is:

• [Speaker] + bilang + [statement]

And the statement itself is:

• cat lama
  • mudah mengelupas
    • kalau terkena air

Very literally:

• Mother said old paint easily peels if exposed to water.

Natural English:

• Mother said that old paint peels easily when it gets wet.

Yes. Kalau can sometimes be understood as if or when, depending on context.

So these are all possible translations:

• Old paint peels easily if it gets wet.
• Old paint peels easily when exposed to water.
• Old paint comes off easily when it gets wet.

The exact English wording depends on style and context, not on a big grammatical difference in the Indonesian sentence.

It is doing a job similar to easily in English, but Indonesian does not always separate adjective/adverb usage the same way English does.

• mudah basically means easy
• in mudah mengelupas, it means easy to peel / peels easily

So even though mudah is often learned as an adjective, in this pattern it creates the meaning:

• easy to + verb or
• verb + easily

That is why mudah mengelupas is naturally translated as peels easily.