Idioms

on probation
serving a period of probation, serving a trial period
The new employee was on probation before he became a regular member of the staff.

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  • on purpose
  • on sale
  • on schedule
  • on second thought
  • on shaky ground
  • on speaking terms with (someone)
  • on standby
  • on target
  • on the air
  • on the alert (for someone or something)
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  • give (someone) a run for their money
  • mean business
  • no end
  • go with (something)
  • get worked up about/over (something)
  • break ground for (something)
  • to and fro
  • in the nature of (something)
  • tell (someone) off or tell off (someone)
  • lose sleep over (someone or something)


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