scrap iron

recycle

recycling

to take out, to get out / to put forth; to show or reveal / to submit, to turn in / to publish, to make public / to demonstrate, to show / to send something, like a letter / to begin, give rise to

rubbish, waste

(archaic) iron / (figuratively) something extremely strong

scrap, waste, bit / human trash, or a scumbag

chemical recycling

iron

iron, the metal and the metallic chemical element / (more generally) steel / short for 鉄砲 (teppō, literally “cannon”, but in this case, refers to the poisonous fugu blowfish or dishes made from it)