There are numerous synonyms for the term "allow to leave," each with a slightly different connotation. The most common synonym is probably "release," which indicates the ending of an obligation or constraint. Other synonyms include "discharge," which implies a formal or official release from a particular obligation or requirement, and "liberate," which suggests a more complete and dramatic sense of freedom or emancipation. "Exonerate" implies a sense of absolution or clearing of guilt, while "excuse" suggests a more informal or personal sense of being allowed to leave. "Dismiss" is a related term that refers to release from a particular duty or position. Overall, the choice of synonym will depend on the specific context and desired tone of the message.