It's one coincidence too many

It's one coincidence too many

CAn anyone explain how this structure works?
I guess it means too many coincidences.

It is usually said sarcastically, as in "I don't think it was coincidence. Just tell the truth."

"It's one too many" usually describes a condition that stretches the imagination or truth.

That was one drink too many. = I'm not in any condition to get home.
It's one coincidence too many. = I think you're telling a lie. No one bumps into any old acquaintance that many times a week.

Ok, thank you. I think I understand it.

Es demasiada coincidencia ...

No sé si preguntabas sobre el funcionamiento de "too many" cuando sigue y no precede a un sustantivo o frase nominal y existe también una cantidad asignada. Si era eso, es en general el equivalente a "de más", y el opuesto "too few" a "de menos":

"INCORRECT HAND. If two players have incorrect hands, one having a card too many and another having a card too few, the dealer may correct it by drawing from the hand with too many cards and giving the excess to the hand with too few. If only one player ...."
Hoyle's Rules of Games

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One Grave Too Many
(Diane Fallon Forensic Investigation #1)

User opinion: This was a super-fast, very interesting and gripping read. I like the character, Diane Fallon, and look forward to learning more about her and her forensic anthropology world in future entries to the series. This one's a winner.
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"Next comes boron with the atomic number five and with five electrons in the shell, so that there are three too many. The following element in the table is carbon with the atomic number six and six electrons in the shell, whereas there ..."

Rambling Through Science

Gracias tb muy interesante.

Es como decir "es el colmo", "es la gota que derrama el vaso"...
La última unidad lo vuelve "demasiado" e inaceptable.

En el caso de la frase, parece ser que ha habido demasiadas coincidencias para haberse dado por casualidad.