sneak peek
Sneak peek (noun) means a short early look at something before it is released or made public, given deliberately to build interest. Example: “The studio dropped a sneak peek of the finale on social media.”
How to use sneak peek
Learner’s notesIn plain EnglishA quick early look at something before everyone else sees it.
Neutral to informal; extremely common in marketing copy.
Fill the gap
Can you complete this real example?
The studio dropped a _____ of the finale on social media.
Etymology
From 'sneak', to move or act secretly, plus 'peek', a quick look. The pairing is reinforced by the rhyme.