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Keywords are:  'thief skill sneaking'

Skill: sneak                    Lvl  5 Thie  (28%)
                                (critical)   Requires: searching
                                Group: Thief stealth skills

Usage:
sneak               - enable or disable sneaking in general
sneak <direction>   - try to move stealthily in the given direction

Sneak is a thief skill used to move quietly through rooms, hoping not to be
seen or heard by others.  Sneaking is not without disadvantages however -
moving quietly can be hard work, and requires extra movement.  Also, if you
are carrying a lot of lights or things that hum, it can be difficult if not
impossible to sneak effectively. Heavier, more protective armor can also
make it more difficult to avoid detection, though an accomplished thief's
skill can easily compensate for this.

This skill improves very slowly with use. The most effective method is to
sneak past dangerous monsters repeatedly, for, as a wise ninja sensei once
said "Fear is a relentless tutor".

To start or stop sneaking, use the 'sneak' command.  Anyone may use
this, but without training your sneaking ability will be limited at best.

There is also a 'sneaking' command, which will tell you whether you
are sneaking.  It will also tell you who in your group is sneaking, if
you are in a group.