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Showing content from http://www.lispworks.com/documentation/lw70/CLHS/Body/f_unexpo.htm below:

CLHS: Function UNEXPORT

Syntax:

unexport symbols &optional package => t

Arguments and Values:

symbols---a designator for a list of symbols.

package---a package designator. The default is the current package.

Description:

unexport reverts external symbols in package to internal status; it undoes the effect of export.

unexport works only on symbols present in package, switching them back to internal status. If unexport is given a symbol that is already accessible as an internal symbol in package, it does nothing.

Examples:

 (in-package "COMMON-LISP-USER") =>  #<PACKAGE "COMMON-LISP-USER">
 (export (intern "CONTRABAND" (make-package 'temp)) 'temp) =>  T
 (find-symbol "CONTRABAND") =>  NIL, NIL 
 (use-package 'temp) =>  T 
 (find-symbol "CONTRABAND") =>  CONTRABAND, :INHERITED
 (unexport 'contraband 'temp) =>  T
 (find-symbol "CONTRABAND") =>  NIL, NIL

Side Effects:

Package system is modified.

Affected By:

Current state of the package system.

Exceptional Situations:

If unexport is given a symbol not accessible in package at all, an error of type package-error is signaled.

The consequences are undefined if package is the KEYWORD package or the COMMON-LISP package.

See Also:

export, Section 11.1 (Package Concepts)

Notes: None.

• PACKAGE-FUNCTION-CONSISTENCY:MORE-PERMISSIVE

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