go down the toilet

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go down the toilet (third-person singular simple present goes down the toilet, present participle going down the toilet, simple past went down the toilet, past participle gone down the toilet)

1. (idiomatic) To fail.
2. (idiomatic) To degenerate rapidly.

• (all senses): go down the drain, go down the plughole; go down the khazi, go down the pan (UK); go down the tubes, go down the tube (US)
• (to degenerate): go to seed, go to the dogs

• circle the drain
• in the toilet