pull the rug (out) from under (someone/something)

to suddenly take away important support from someone.

The school pulled the rug from under the local team by making them pay to practice in the school gym.

• One step forward, two steps back.
• one swallow doesn't make a summer
• one thing after another
• one thing leads to another
• one-to-one
• one-two punch
• one-upmanship
• on everyone's lips
• one way or another
• one way or the other
• one-way ticket to
• one-way ticket to something
• on feet
• on file
• on good side
• on good terms
• on good terms with
• on good terms with someone
• on guard
• on hand
• on head be it
• on high
• on hobbyhorse
• on hold
• on honor