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Built-in Mathematica Symbol

TagUnset (/: =.)

f/:lhs=.
removes any rules defined for lhs, associated with the symbol f.

Rules are removed only when their left-hand side is identical to lhs, and the tests in Condition given on the right-hand side are also identical.

Clear immediate definitions:

Clear delayed definitions:

Use =. to clear definitions with a particular left-hand side:

Clear all definitions:

To clear an upvalue, the tag is required: