the.com/catchphrase

A sentence you say so often it starts saying you.

means A phrase or expression repeated so often it becomes associated with a particular person, character, or group.

from A straightforward compound of 'catch' (to seize or hold attention) and 'phrase,' emerging in the 1800s alongside the rise of popular theater and music halls, where performers found that a repeated, snappy line would 'catch' the ear of the audience and keep them coming back for more.

origin
from vaudeville, built to get repeat applause
economics
sitcoms recycle them to cut writing costs
risk
outlives the career that made it famous
test
if you can mime it, it is one
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