on
the/one's way out soon
to be replaced by someone or something else; no longer successful,
popular, or effective; becoming unfashionable, obsolete,
unfashionable, obsolescent, etc.; dying;
When
something is "trending down" or "losing popularity,"
it is said to be "on its way out." If it is a product,
maybe it is still available in stores, but it isn't the most popular
or talked about item and is losing momentum against some new trend.
The old type
of passport is on its way out.
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