bunrisugeoreul kkamppakhalkka bwa dallyeoge sseuregibongtu beorineun nareul memohae dwosseoyo.

Yes, 깜빡하다 can mean different things depending on context.

In this sentence, 깜빡하다 means to forget absentmindedly or to let something slip your mind.

So:

• 분리수거를 깜빡하다 = to forget the recycling/trash-sorting
• not to blink

This is a very common everyday use. It often sounds a little casual and natural, like forgetting something because you were distracted.

Because 깜빡하다 here works like a verb that can take a direct object: forget something.

So:

• 분리수거 = recycling / sorting recyclables
• 를 = object marker
• 분리수거를 깜빡하다 = to forget the recycling

English often says forget to do recycling, but Korean can treat the activity itself as the object of 깜빡하다.

You could think of it as:

• I forgot the recycling
• meaning I forgot to do the recycling

-ㄹ/을까 봐 means something like:

• because I was worried that...
• for fear that...
• in case...

So 깜빡할까 봐 means:

• because I was worried I might forget
• for fear that I’d forget

This grammar is used when someone takes an action to prevent a possible bad result.

In this sentence, the speaker wrote it down on the calendar because they were worried they might forget.

That is very normal in Korean.

Korean often puts:

1. the reason/background first
2. the main action later

So the sentence structure is basically:

• Because I was worried I might forget...
• I wrote it down on the calendar.

This order is extremely common and usually sounds natural. English can do this too, but Korean relies on this kind of build-up even more often.

달력에 means on the calendar.

The particle 에 is used here to mark the place where something is written.

So:

• 달력 = calendar
• 달력에 메모하다 = to make a note on the calendar

You can think of 에 here as similar to:

• on
• in
• at

depending on context.

Examples:

• 공책에 썼어요 = I wrote it in/on the notebook
• 벽에 붙였어요 = I attached it to/on the wall
• 달력에 메모했어요 = I wrote a memo on the calendar

This is a noun-modifying clause.

Break it down like this:

• 쓰레기봉투 = trash bag / garbage bag
• 버리다 = to throw away
• 버리는 = throwing away / the one where you throw away
• 날 = day

So 쓰레기봉투 버리는 날 literally means:

• the day (when you) throw away the trash bag
• more naturally, the trash day / the day to put out the trash bag

In Korean, verbs often come before a noun to describe it:

• 먹는 음식 = food that one eats
• 사는 집 = the house one lives in
• 버리는 날 = the day when one throws it away

Both forms are possible in Korean, but they do not feel exactly the same.

In this sentence, 버리는 날 is more natural because it refers to a scheduled or habitual kind of day: the day when trash gets thrown out.

A simple way to think about it:

• 버리는 날 = the day when one throws it away / trash-disposal day
• 버릴 날 = the day on which one will throw it away

For regular schedules, calendar events, or recurring routines, Korean often prefers the -는 form.

So 쓰레기봉투 버리는 날 sounds like a normal calendar label or routine expression.

The subject is not stated, and that is very normal in Korean.

It is understood from context as something like:

• I
• we
• people in the household
• or just a general you/one

So 쓰레기봉투 버리는 날 does not need an explicit subject. Korean very often omits subjects when they are obvious from context.

That is why this phrase sounds natural even without saying exactly who throws the trash away.

메모해 뒀어요 comes from 메모해 두었어요.

The grammar -아/어 두다 means:

• to do something in advance
• to do something and leave it that way for later use

So:

• 메모했어요 = I wrote a memo
• 메모해 뒀어요 = I wrote a memo down and left it there for future reference

That nuance is important here. The speaker didn’t just write it; they wrote it down so they would remember later.

This matches the earlier part 깜빡할까 봐 very well.

뒀어요 is a contracted spoken/written form of 두었어요.

So:

• 메모해 두었어요 → 메모해 뒀어요

This contraction is very common in everyday Korean.

Other similar contractions:

• 놓았어요 → 놨어요
• 보았어요 → 봤어요
• 두었어요 → 뒀어요

So 메모해 뒀어요 is just the natural shortened form of 메모해 두었어요.

Because the sentence is talking about the completed action of writing the memo.

The speaker is saying that they already wrote it down.

With -아/어 두다, the past tense often focuses on:

• the action having been done already
• the result still being in place now

So 메모해 뒀어요 means something like:

• I wrote it down beforehand
• and the note is still there as a result

This is very natural in Korean. The action happened in the past, but its effect continues into the present.

It is in the -어요 style, which is polite but conversational.

So it is appropriate for:

• everyday polite conversation
• speaking to someone you are not extremely close to
• neutral, standard spoken Korean

It is less formal than:

• 메모해 두었습니다

and more polite than:

• 메모해 뒀어

So the sentence sounds natural and standard for normal conversation.