This is the 10106th most frequent French word.
habillent
"Habillent" means "dress" or "are dressing" (referring to they/them).
In this sentence, 's'habillent' is used reflexively to indicate that the children are dressing themselves.
Les enfants s'habillent rapidement avant de sortir.
The children get dressed quickly before going out.
Here, 'habillent' is used transitively to mean dressing someone or something else, in this case, the doll.
Ils habillent la poupée avec une tenue colorée.
They dress the doll in colorful clothing.
In this example, 's'habillent' again takes on a reflexive usage, where the actors are putting on their costumes themselves.