all washed up (informal) done for (informal) finished, lost, on the rocks, ruined, up the creek without a paddle (informal)
English Collins Dictionary - English synonyms & Thesaurus
1 Sunk is the past participle of sink.
2 adj If you say that someone is sunk, you mean that they have no hope of avoiding trouble or failure.
INFORMAL v-link ADJ
Without him we'd be well and truly sunk.
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