One of the mysteries of the English language finally explained.
1‘the estate agent was acting for a prospective buyer’
represent, act on behalf of, speak on behalf of
stand in for, fill in for, deputize for, cover for, substitute for, be a substitute for, replace, take the place of, act in place of, be a locum for, do a locum for, sit in for, understudy
hold the fort, step into the breach
informal sub for, fill someone's boots, fill someone's shoes
North American informal pinch-hit for
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