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Difference between Be on the sick and Be sick

be on the sick —(coll.) be on sick list; receive sickness benefit:

  • Dad used to be on the sick for a long time and couldn’t work.

be sick

1. be unwell; be affected by illness:

  • When she was sick he wanted her to get the best doctor.

2. (have an inclination to) vomit:

  • “Ouch!” said Joss and looked as if she would be sick again.