hold the fort
• take responsibility for a situation while another person is temporarily absent.
Similar:
stand in,
fill in,
act as stand-in,
deputize,
act as deputy,
substitute,
act as substitute,
take over,
be a substitute,
take someone's place,
act in someone's place,
do duty,
do a locum,
be a locum,
sit in,
understudy,
step into the breach,
fill someone's shoes/boots,
pinch-hit,
