keep somebody's seat, etc. warm

keep (one's) (something) warm

To occupy a position for or take over the responsibility of someone else while they are absent. Usually used in the form "keep (one's) seat warm," and often followed by "for (one)." I'm don't usually work in reception; I'm just keep Mary's seat warm while she's on sick leave. Bob asked me to keep his place warm while he's on vacation, so, if you have any questions, you can direct them to me.
See also: keep, warm

keep somebody’s ˈseat, etc. warm (for them)

(informal) remain in a job, an official position, etc. until somebody is ready to take it, especially so that a third person cannot do so: She’s not the regular driver — she’s just keeping his place warm for him until he gets back.
See also: keep, warm
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