NEXO value drop, which means you lost capital on the tokens
Note that using NEXO token works because NEXO also pays dividends on it's token, so it's more worth it to use NEXO as collateral as opposed to say BTC.
Please only borrow in USDC, if you borrow in DAI, for example, you might get a shock in the event of this happening
NEXO value drops and you get liquidated due to over-borrowing. As of writing, NEXO is trading at 0.69 USD if the value crashed your NEXO collateral will be liquidated to maintain your collateral: debt ratio