This is the 520th most frequent Finnish word.
maahan
"Maahan" means "to the ground" or "into the ground" in English.
In this sentence, 'maahan' is used to indicate the action of moving towards the ground.
Lintu laskeutui maahan.
The bird landed on the ground.
Here, 'maahan' refers metaphorically to a country as a destination of movement.
Hän muutti maahan jo viisi vuotta sitten.
They moved to the country already five years ago.
In this context, 'maahan' again refers to the ground as the target location of the action.