Kwa upande mmoja, tunarejeleza; kwa upande mwingine, tunatupa.

Literally, it means on one side ... on the other side.

In actual usage, it works like the English expression on the one hand ... on the other hand. It introduces a contrast between two ideas.

• kwa = by/on/in terms of
• upande = side
• mmoja = one
• mwingine = another/the other

So this is an idiomatic contrast structure, not usually about physical sides.

Kwa is a very common Swahili preposition. It can have several meanings depending on context, including by, for, at, with, or in terms of.

In kwa upande mmoja, it is part of a fixed expression. You can think of it as meaning something like:

• from one point of view
• on one side
• in one respect

So learners should usually memorize kwa upande mmoja ... kwa upande mwingine as a set phrase.

Those words agree with the noun upande.

In Swahili, adjectives and similar modifiers often change form to match the noun class of the noun they describe. Here:

• upande mmoja = one side
• upande mwingine = the other side / another side

So mmoja and mwingine are not random forms; they are agreeing with upande.

For an English speaker, the main takeaway is: Swahili modifiers often change shape depending on the noun they go with.

It can be broken down like this:

• tu- = we
• -na- = present tense / ongoing / general present
• rejeleza = verb stem

So tunarejeleza means we recycle / we are recycling, depending on context.

A very useful pattern in Swahili is:

subject prefix + tense marker + verb stem

For example:

• ninasoma = I am reading / I read
• unasoma = you are reading / you read
• tunasoma = we are reading / we read

So tunarejeleza follows a very standard pattern.

It has the same structure:

• tu- = we
• -na- = present tense
• tupa = throw away / discard

So:

• tunatupa = we throw away / we are throwing away

Again, this is the same common Swahili verb pattern:

tu- + -na- + tupa

Because Swahili usually puts the subject inside the verb itself.

In English, you need a separate subject word:

• we recycle
• we throw away

In Swahili, the tu- at the beginning of the verb already means we, so you do not need an extra independent pronoun.

So:

• tunarejeleza already includes we
• tunatupa already includes we

You could add sisi for emphasis, but it is not necessary:

• sisi tunatupa = we throw away

That sounds more emphatic, like stressing the subject.

It can do either, depending on context.

In many cases, -na- covers both:

• we are recycling
• we recycle

and also:

• we are throwing away
• we throw away

In this sentence, it most naturally sounds like a general present statement, but the exact English translation depends on context.

This is normal in Swahili: one tense form often corresponds to more than one English tense.

Because the object can be left unstated if it is already understood from context.

English also does this sometimes:

• We recycle; we throw things away.

If the topic has already been established, Swahili does not need to repeat the object.

For example, if everyone already knows you are talking about waste, plastic, or materials, then just saying:

• tunarejeleza
• tunatupa

is completely fine.

If you wanted to specify the object, you could add it:

• tunarejeleza plastiki = we recycle plastic
• tunatupa taka = we throw away waste

The semicolon links two closely related clauses that contrast with each other.

That fits this sentence well because the two ideas are parallel:

• kwa upande mmoja, tunarejeleza
• kwa upande mwingine, tunatupa

The semicolon is a punctuation choice, not a special Swahili grammar rule. A comma or a conjunction could also be used in some contexts.

For example, you may also see:

• Kwa upande mmoja, tunarejeleza, lakini kwa upande mwingine, tunatupa.

Adding lakini makes the contrast more explicit.

Yes. Kwa upande mmoja ... kwa upande mwingine is a natural and useful way to present two contrasting sides of an issue, especially in writing, discussion, argument, or formal speech.

It is especially common when someone is weighing two perspectives:

• one positive side
• one negative side
• one action versus another
• one argument versus a contrasting argument

So it is a good expression to learn as a whole chunk.

Not always. A literal translation helps you understand the structure, but the best English equivalent is often:

• on the one hand ... on the other hand

That is because the Swahili phrase is often idiomatic and contrastive, not spatial.

So for learning purposes:

• literal sense: on one side / on the other side
• natural function: on the one hand / on the other hand

That is the most useful way to understand it.