under the microscope

/AH1 N D ER0 DH AH0 M AY0 K R AH0 S K OW0 P/
adverb
  1. 1

    Under close scrutiny or examination.

    โ€œAfter his productivity flagged, his boss put him under the microscope to try to isolate and correct the problem.โ€

Source: https://en.wiktionary.org/wiki/under%20the%20microscope