Question 1

Why is хребтом in the instrumental case without a preposition like по?

Accepted Answer

This is the Bare Instrumental of Route, which shows the physical path a movement takes. You could absolutely say по хребту (dative with по), which is more common in modern conversational Russian. The bare instrumental (хребтом) feels a bit more literary and descriptive, and is often used with continuous natural landscapes like a forest (лесом) or a field (полем).

Question 2

Doesn't the word хребет normally mean 'spine' or 'backbone'?

Accepted Answer

Yes, its literal anatomical meaning is a spine or backbone. By extension, it is the standard geographical term for a mountain ridge or a mountain range (often горный хребет). Just like a spine, a ridge is an elevated, continuous structure running across the landscape.

Question 3

What nuance does the verb пробирается add compared to a simpler verb of motion like идёт?

Accepted Answer

While идёт just means 'is walking', the reflexive verb пробираться means to make one's way with effort, caution, or stealth. It implies that the terrain on the ridge is difficult or dangerous to navigate, which perfectly explains why the guide is doing it осторожно (carefully).

Question 4

Can I use the bare instrumental of route with any location, like walking along the street (идти улицей)?

Accepted Answer

It is grammatically possible and you will see it in classical literature, but in modern everyday speech, the bare instrumental of route is mostly restricted to natural, expansive landscapes (like fields, forests, or ridges) or a general medium of travel (like ехать морем, to travel by sea). For a street, you would almost always use по улице.

Проводник осторожно пробирается хребтом.

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