المصباح اليدوي على وشك أن يومض.

Yes, it is two words:

• المصباح = the lamp / the light
• اليدوي = hand-held / manual

So المصباح اليدوي literally means the hand-held lamp, which is the standard Modern Standard Arabic way to say flashlight.

Depending on region, everyday speech may use other words too, but مصباح يدوي is a very normal MSA term.

In Arabic, adjectives normally come after the noun they describe.

So:

• مصباح يدوي = a hand-held lamp / a flashlight
• not يدوي مصباح

This is the normal order in Arabic:

• noun first
• adjective second

So المصباح اليدوي is literally the lamp the-hand-held in Arabic word order.

Because Arabic adjectives agree with the nouns they describe in definiteness.

Here:

• المصباح is definite: the lamp
• so the adjective must also be definite: اليدوي

That is why you get:

• المصباح اليدوي = the flashlight

Compare:

• مصباح يدوي = a flashlight
• المصباح اليدوي = the flashlight

So when the noun is definite, the adjective usually becomes definite too.

Because in Arabic, the present tense verb to be is usually not stated.

So the sentence is literally structured like this:

• المصباح اليدوي = the flashlight
• على وشك أن يومض = about to flash

Arabic does not need a separate present-tense is here.

So:

• المصباح اليدوي على وشك أن يومض literally works like
• The flashlight [is] about to flash

If you wanted past tense, then Arabic would usually use a verb such as كان.

على وشك is a fixed expression meaning:

• about to
• on the verge of
• just about to

It gives a sense that something will happen very soon.

So:

• على وشك أن يومض = is about to flash

Literally, وشك has the sense of a brink or edge, so the expression gives the idea of being on the point of doing something.

After على وشك, Arabic normally uses:

• أن + imperfect verb

So the pattern is:

• على وشك أن + verb

Examples:

• أنا على وشك أن أخرج = I am about to leave
• القطار على وشك أن يصل = The train is about to arrive

So in your sentence:

• على وشك أن يومض = about to flash

You can think of أن here as part of the standard structure, somewhat similar to English to in about to flash, although it is not exactly the same thing grammatically.

Formally, يومض is an imperfect verb form. In Arabic, the imperfect can cover:

• present
• future
• general/habitual action

Here, because of على وشك, it clearly refers to the near future:

• is about to flash

So the time meaning comes from the whole expression, not from the verb by itself.

It comes from the verb أومض / يومض, which means:

• to flash
• to flicker
• to blink

In fully vocalized MSA here, it is read as يُومِضَ after أن.

A rough pronunciation is:

• yoo-miḍa

If you pause at the end in normal speech, you may hear it more like:

• yoo-miḍ

The last consonant ض is an emphatic Arabic sound, often approximated for learners as a heavy d.

Yes. After أن, the imperfect verb is normally in the subjunctive.

So in full vocalization, it would be:

• أن يُومِضَ

The important point for a learner is:

• in ordinary Arabic writing, short vowels are usually not written
• so يومض looks the same on the page whether you show the ending clearly or not

That means the grammatical change is real, even if it is invisible in unvowelled text.

A fully vocalized version would be:

• المِصْباحُ اليَدَوِيُّ على وَشَكِ أَنْ يُومِضَ

This shows a few useful things:

• المصباحُ is nominative because it is the subject of the sentence
• اليدويُّ matches it as an adjective
• وشكِ is genitive after على
• يُومِضَ is subjunctive after أن

In normal modern writing, these short vowels are usually omitted.

Good question. The meanings are close, but not identical.

• سيومض / سوف يومض = it will flash
• على وشك أن يومض = it is about to flash

So على وشك أن is more immediate. It suggests the action is going to happen very soon, almost right now.

That makes it stronger and more specific than a simple future.

It can describe many things. يدوي means manual, hand-operated, or hand-held, depending on context.

For example:

• عمل يدوي = hand-made work / handicraft
• تشغيل يدوي = manual operation
• مصباح يدوي = flashlight

So in this sentence, يدوي is not a special flashlight word by itself; it is a general adjective whose meaning becomes hand-held here.