por un instante

for a moment

→ por
phrase Rare #32,561
for a moment Used for something very brief. In negative phrases, like "ni por un instante," it means "not even for a moment."
SP: Por un instante, no supe qué decir.
EN: For a moment, I didn't know what to say.

Guardaron silencio por un instante.

They remained silent for a moment.

Tom y María se miraron el uno al otro por un instante.

Tom and Maria looked at each other for a moment.

Ni por un instante.

Not for a moment.

La criada perspicaz ha salido por un instante.

The perceptive maid has stepped out for a moment.

— La doncella (2016)

Por un instante, me quedé sin palabras.

For a moment, I was speechless.

Me sentí más aliviado por un instante.

I felt more relieved for a moment.

Por un instante pensé que iba a morir.

For a moment I thought I was going to die.

Él titubeó por un instante.

He hesitated for a moment.