(literally) Pockets long enough inside to accommodate more than average number or size of contents.

(computing) A copy of a data structure duplicating not only the structure itself, but all structures to which it is linked.

(transitive) To make a deep copy of. / (intransitive) To make a deep copy.

(figuratively) Shallow, superficial.

(idiomatic) Involved in a situation to the extent that one cannot cope.

Used other than figuratively or idiomatically: see deep, water. / Waters suitable for deep-draft ships, especially ocean-going. / (idiomatic) A difficult or embarrassing situation.

Having a great depth of water. / Carried out at great depth. / Located in or near deep ocean waters. / Living at a great depth underwater

(astronomy) Existing outside of the Solar System; relating to that which exists outside of the Solar System.

Reaching up to the knees. / Submerged to the knees. / (figuratively, by extension) Deeply involved in something, or preoccupied with something.

A secret informant possessing valuable information, especially one who stays secret long after the incident in question is concluded.