Clarification connectors (ou seja, isto é)

When you need to rephrase, specify, or clarify a statement, you can use a clarification connector. In intense situations—like coordinating a mountain climbing expedition—making sure your team understands you perfectly is crucial.

The two most common phrases for this in Portuguese are isto é and ou seja. Both serve the same purpose and are highly interchangeable.

Isto é

Literally translating to "this is", isto é is used exactly like the English expression "that is" to clarify or elaborate on a previous point.

The climber does not see anything on the mountain, that is, the fog is extreme.
O alpinista não vê nada na montanha, isto é, o nevoeiro é extremo.
I was climbing the frozen slope, that is, the danger was enormous.
Eu estava a subir a encosta congelada, isto é, o perigo era enorme.

Ou seja

Ou seja literally translates to "or let it be", but it functions as "in other words". Use it to restate information in a clearer, more direct way.

The climbers are sick due to not having oxygen, in other words, the problem is critical.
Os alpinistas estão doentes por não terem oxigénio, ou seja, o problema é crítico.
The climber never takes any rope for the climb, in other words, the risk is critical.
O alpinista nunca leva nenhuma corda para a escalada, ou seja, o risco é crítico.

Punctuation and Structure

Notice that both isto é and ou seja are typically surrounded by commas when they appear in the middle of a sentence.

These connectors can link two complete clauses (each with its own verb) to explain a consequence or add context to a situation:

A wrong step is fatal, in other words, we must be careful in the abyss.
Um passo errado é fatal, ou seja, devemos ter cuidado no abismo.

They can also link smaller phrases just to specify a detail or provide a synonym:

We must reach the summit quickly, in other words, before the storm.
Devemos chegar ao cume rapidamente, ou seja, antes da tempestade.
The climbers stopped due to feeling very cold, in other words, due to being frozen.
Os alpinistas pararam por sentirem muito frio, ou seja, por estarem congelados.

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