Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: What do you do with someone who is a nagger (one who nags)? You have to flush them down the toilet. Imagine someone nagging you to do your chores so you flush them down the toilet, somehow.
You forgot to flush the toilet, didn't you?
Do you know why they are pouring oil over the swamp?
A Tofugu custom involves cutting paper into the shape of fugu and setting them afloat down a stream on Koichi’s birthday.