のぞnozoku
1.

To secretly look at something that is partially obstructed or difficult to see, often through a narrow opening or from a hidden position.

2.

To take a brief glance at a place or object out of curiosity, often without a specific intention beyond casual observation.

3.

To observe something discreetly, especially when trying to uncover hidden or private information about someone or something without being detected.

4.

To have a small part of something visible from behind an obstruction, indicating a glimpse of something that is otherwise concealed.

Example:

私は壁の裂け目から外を覗いた。