German · Pronunciation Guide
DEE. The ie is a long 'ee', so it has nothing to do with the English word spelled the same way.
This is almost never the loudest word in its sentence: the article gives its weight to the noun, and even the long vowel stays short in duration when the phrase is spoken quickly. Like der, it takes real stress only when used demonstratively, pointing at something specific.
Listen: die
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Die Tür ist offen.
The door is open.
Listen: Die Tür ist offen.
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Die Tür ist offen shows the feminine article doing its ordinary job. Tür has the long front-rounded ü and the vocalised r, coming out roughly 'tuer'. Offen begins on a glottal stop and its double f keeps the o short, with the ending collapsing to a syllabic n: 'OFF-n'.
The written form is identical to an English word with a grim meaning, and that association makes beginners say 'dye'. German ie is always a long 'ee'. It is worth pairing this word with die from the start: the article is dee, and the same letters in nie, wie and sieben behave identically, so one correction fixes a whole family.