the.com/sidetrack

The scenic route your focus takes on its way to never arriving.

means To divert someone (or yourself) from the main task or topic onto something less important.

from Literal before it was figurative: a 'side track' was a railway siding, a branch line off the main track where freight cars got shunted out of the way. By the late 1800s, Americans started using 'sidetrack' as a verb for derailing trains onto these spurs — and it didn't take long for the word to jump from railyards to conversations and to-do lists, describing anything, or anyone, shunted off the main line of attention.

origin
Literally railroad lingo for a siding track off the main line
verb shift
Became 'to divert attention' by the late 1800s
irony
Often starts with 'quick, one more thing first'
modern form
Now mostly triggered by a phone, not a train
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