1.
deficit-financing bonds, deficit bonds
Government bonds issued to cover budget deficits, as opposed to construction bonds (建設国債) which fund public works. Formally called 特例国債 (special bonds) because their issuance requires special legislation each year.
The government aims for fiscal management that doesn't rely on deficit bonds.
Cultural note
赤字国債 are government bonds issued to fill gaps between tax revenue and expenditure. Japan's 財政法 (Fiscal Law) originally prohibited deficit bond issuance, so the government must pass special legislation (特例法) each year to authorize them.
The formal name is 特例国債 (special exception bonds), but 赤字国債 is the common term used in media and public discussion.