moss
US /mɑːs/
UK /mɑːs/

1.
mousse
a small flowerless green plant that lacks true roots, growing in low carpets or rounded cushions in damp habitats and reproducing by spores.
:
•
The old stone wall was covered in soft green moss.
Le vieux mur de pierre était couvert de mousse verte douce.
•
Be careful, the steps are slippery with moss.
Fais attention, les marches sont glissantes à cause de la mousse.
1.
se couvrir de mousse
cover with moss.
:
•
The old roof had begun to moss over.
Le vieux toit avait commencé à se couvrir de mousse.
•
The stones in the garden were slowly mossing.
Les pierres du jardin se couvraient lentement de mousse.