Why don't we leave this creamy chicken pot pie for tomorrow?
Koichi passed away and left a huge amount of debt behind for Viet.
Thieves broke into the Tofugu office and stole some of our stickers last night, but they were so stupid that they made the elementary mistake of leaving behind their fingerprints.
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means remainder, but you can't really "to remainder." What is something that's similar that would make sense? How about to leave behind. This is when you're actually doing the leaving behind too. For example, you eat some food and you leave behind your rice because you're a bad child. You can remember this because of す. Every time you leave some food behind your mom would sue you, because she was a terrible mom. Imagine this.
The reading for this word can come from level 14 item 残る. Associate the two in your mind and you'll be able to read both.