This is the 6732nd most frequent Russian word.
scythe
A farming tool with a long curved blade used for mowing grass or reaping crops.
Here, 'Коса' (Kosa) refers to a farming tool, indicating its literal meaning of 'scythe'.
Коса — это инструмент для покоса травы.
The scythe is a tool for mowing grass.
In this context, 'коса' (kosa) is used to mean 'braid', demonstrating a homonymous meaning of the word.
У девушки была длинная коса, спускавшаяся по спине.
The girl had a long braid that fell down her back.
Here, 'коса' (kosa) refers to a 'sand spit', which is a geographical feature, illustrating another contextual usage of the word.