Dead air

1. An uncomfortable period of awkward silence that usually occurs in a tense social setting;

2. A period of time during which a television show is broadcast without an audio portion.

Man 1: How was the blind date?

Man 2: OK, but we ran out of things to say while we were at the bar. When we sat down for dinner, neither one of us could think of a thing to say. It was 100% dead air for about five minutes.

Man 1: So you didn't get laid?

Man 2: Asshat.

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dead air

a sudden and undesirable silence (from the term for the interruption of radio or television broadcasts)

The dead air coming from the bathroom was sign that something dire had happened.

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dead air pressure

Level of dead air.

(Dead air)
Someone: "Oh God the dead air pressure is high!"