1. Sand that yields under weight or pressure, causing objects or people to sink into it; quicksand
The explorers had to carefully navigate across the sinking sand in the desert.
Os exploradores tiveram que navegar cuidadosamente através da areia movediça no deserto.
2. Figuratively, an unstable or unreliable foundation or situation
Building a relationship on lies is like building on sinking sand.
Construir um relacionamento sobre mentiras é como construir sobre areia movediça.