soubassement angolul

bedrock▼◼◼◼(underground solid rock)
noun
[UK: ˈbed.rɒk] [US: ˈbed.rɑːk]

underpinning▼◼◼◻(a support or foundation of a structure)
noun
[UK: ˌʌn.də.ˈpɪn.ɪŋ] [US: ˈʌn.dər.ˌpɪn.ɪŋ]