Yeah, slang typically originates from expressions that are in everyday use among significant subcultural population. ‘Washed up’ could’ve been related to the sea if it were coined in the mid-nineteenth century at the latest, when seaside occupations were still dominant in the economy, especially in the UK. But it’s too far-fetched for the twentieth century, when urban life became more important.
Yeah, slang typically originates from expressions that are in everyday use among significant subcultural population. ‘Washed up’ could’ve been related to the sea if it were coined in the mid-nineteenth century at the latest, when seaside occupations were still dominant in the economy, especially in the UK. But it’s too far-fetched for the twentieth century, when urban life became more important.