sandbagging
suing for a breach of a contractual representation or warranty despite having known at the time of the contract that it was untrue
en-GB/ˈsændbæɡɪŋ/
en-US/ˈsændˌbæɡɪŋ/
suing for a breach of a contractual representation or warranty despite having known at the time of the contract that it was untrue