What does the idiom catch in his voice mean?

The idiom "catch in his voice" doesn't exist as a common phrase.

It's possible you're thinking of "a catch in his voice", which is a common idiom that describes a slight change in someone's voice, often indicating emotion like sadness, fear, or nervousness.

Here's a breakdown:

* "Catch" refers to a brief, noticeable change in tone, often a momentary hitch or break.

* "Voice" simply indicates the speaker's vocalization.

So, "a catch in his voice" suggests that the speaker's voice has become slightly strained or altered, likely due to emotion.

Here's an example:

* "He told me about his loss, and there was a catch in his voice as he spoke about his wife."