"Chafed at the bit" is a common phrase used to describe impatience or frustration. However, there are several synonyms that can be used interchangeably. Some examples include "restless," "frustrated," "eager," "impatient," "antsy," "agitated," and "longing." These words express the same sentiment of feeling confined or restrained, and wanting to move forward or take action. "Chomping at the bit," "itching to get going," and "raring to go" are other idioms that convey a similar impatience to "chafed at the bit." Whether you use one of these variations or the original phrase, the meaning remains clear: the person is ready to take action and wants to move forward.