a heartbeat from

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heartbeat (away) from being (something)

In a position to move into a position immediately upon the absence of one's superior or predecessor (often assumed to mean from death). The position of vice president may not seem important, but whoever it is will be a heartbeat away from being president, so we should take that into account when voting.
See also: being, heartbeat
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

a heartbeat (away) from

very close to; on the verge of.
See also: heartbeat
Farlex Partner Idioms Dictionary © Farlex 2017
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