step in

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step in

  1. (intransitive) To act as a replacement or substitute.
    • 2011 December 29, Keith Jackson, “SPL: Celtic 1 Rangers 0”, in Daily Record[1]:
      McCoist unexpectedly ushered back a defender of his own with Kirk Broadfoot taking over from Steven Whittaker. There was, of course, another change, Kyle Bartley stepping in at centre-half to replace suspended Dorin Goian.
  2. (intransitive) To get involved; to act