Learn Spanish (Latin America): Haz una pausa muy dramática aquí.

Haz is the irregular affirmative tú (informal "you") command form of the verb hacer (to do/make). Normally, to tell a friend to do something, you use the standard third-person form of the verb, but hacer has this special, short command form.

Is there a single verb for "to pause" in Spanish, or do you always use hacer?

While the single verb pausar exists, it is much more natural and common in conversational Spanish to use the phrase hacer una pausa (literally "to make a pause") when telling someone to stop briefly or take a break.

Why does muy dramática come after una pausa?

In Spanish, descriptive adjectives like dramática almost always go after the noun they describe. So, instead of saying "a very dramatic pause," the order is una pausa muy dramática. Notice that it also ends in -a to match the feminine noun pausa.

Why does dramática have an accent mark on the second "a"?

The accent mark tells you exactly where to put the spoken stress. In Spanish, any word that is stressed on the third-to-last syllable (like dra-má-ti-ca) always requires a written accent mark to break the standard pronunciation rules.