Cotejamos el bombín y la mirilla.

Cotejamos is from cotejar.

It can be:

• present indicative: we compare / we check / we match
• preterite: we compared / we checked / we matched

This happens because for many -ar verbs, the nosotros form is spelled the same in the present and the preterite:

• cotejamos = present
• cotejamos = preterite

So the tense is decided by context, not by the form alone.

Because Spanish often leaves out subject pronouns when the verb ending already makes the subject clear.

Here, -amos tells you the subject is we. So Cotejamos... already means We check / We checked...

You could say Nosotros cotejamos el bombín y la mirilla, but that would usually add emphasis, contrast, or clarification.

Cotejar usually sounds a bit more careful, technical, or formal than comparar.

It often means:

• to compare carefully
• to cross-check
• to verify one thing against another

So cotejar suggests more than just noticing similarities and differences. It often implies checking whether things match correctly or are consistent.

In practical contexts, especially technical or professional ones, cotejar can sound very natural.

In this sentence, bombín most likely means the lock cylinder of a door.

That is the usual interpretation in Spain when talking about doors, locks, and related parts.

Yes, bombín can also mean a bowler hat in other contexts, but with la mirilla in the same sentence, the door-related meaning is clearly the intended one.

Mirilla usually means a peephole in a door.

More generally, it can refer to a small viewing hole or sighting point, but in a sentence with bombín, the most natural meaning is the peephole on a door.

Spanish very often uses the definite article with specific concrete objects where English might or might not do the same.

Here, el bombín y la mirilla means:

• the lock cylinder and the peephole

Repeating the article before each noun is normal because the nouns have different genders:

• el bombín
• la mirilla

Leaving the articles out would sound unnatural in this sentence.

Because the sentence is talking about one bombín and one mirilla.

So it means:

• one lock cylinder
• one peephole

That is the most natural reading, especially if the speaker is referring to one specific door or one specific set of parts.

Yes, it is natural, but it sounds somewhat technical or professional.

It could fit contexts like:

• a locksmith
• a security installer
• a repair technician
• an inspection report

In more everyday speech, many speakers might say something like:

• Comprobamos el bombín y la mirilla
• Revisamos el bombín y la mirilla

Those can sound a little more common in casual conversation.

A simple pronunciation guide would be:

• cotejamos → ko-te-HA-mos
• el bombín → el bom-BEEN
• y la mirilla → ee la mee-REE-ya

A few useful notes:

• The j in cotejamos is the Spanish j sound, not the English j.
• bombín is stressed on the last syllable because of the written accent.
• mirilla is stressed on ri.

Yes. Spanish word order is flexible.

For example, you could also say:

• Cotejamos la mirilla y el bombín.

That would still be grammatical. The original order just presents bombín first.

In neutral Spanish, the given sentence sounds perfectly normal.