Synonyms for underscore

This is not, repeat, underscore, not an intervention in planetary government.

So we underscore them, putting a single score under k, and a double one under k′.

I should like to underscore this last sentence, my dears, in view of what comes after.

I underscore the word “hotter,” to denote the prevalent theory.

Underscore all of the adjectives in the following quotation.

Underscore all the verbs and verb phrases in the following quotation.

Why not have the underscore raised to the position of a hyphen and so have a dash that is a dash?

I underscore the word "hotter," to denote the prevalent theory.

Underscore the names with wave lines so that they shall be printed in display type.

Count eighteen words on, then underscore five consecutive ones.