narrow margin
narrowness
slimness

He was a popular leader but lost the election by a very narrow margin.

You're working on a very narrow margin, you see, between bit and miss.

But by a narrow margin, things are getting better in Iraq.

Running on the Democratic line, he won election by a narrow margin.

He caught it, true, but only by a very narrow margin.

He and his wife lived on a very narrow margin.

The name change was passed by a narrow margin of 3,123 to 3,003.

There wasn't room for that in the narrow margin of life left to them.

On 16 February 1936, the left won by a narrow margin.

In 1986 he lost by a narrow 52% to 48% margin.