This drop in the lira occurred as the Central Bank of the Republic of Turkey (CBRT) withdrew additional liquidity measures to support the beleaguered currency.
You could see the lira flashing warning signals on Monday night, when the overnight forward implied yield on the Turkish Lira went into hyperspace, soaring to over 1,000% as a freeze on lira liquidity caused anguish for foreign investors caught on the wrong side of the carry trade. This was the result of the intentional efforts of the Turkish government and the Central Bank of Turkey, which has prevented Turkish banks from selling or lending to lira to foreign investors. So that’s why foreigners had to borrow lira in offshore market, hence the massive short squeeze.