<p>In a merely verbal agreement, a misunderstanding between two parties creates the false impression of agreement: one or both parties think they agree on something, when in fact they do not. There is reason to believe that merely verbal agreements are as common as merely verbal disagreements and disputes. Unlike the latter, however, merely verbal agreements have so far been ignored by philosophers. The purpose of this paper is twofold: first, to clarify what merely verbal agreement is by considering various ways of defining and refining the notion; and second, to explore the effects of merely verbal agreement on conversational common ground, collaborative action, and academic philosophy. It will be argued that merely verbal agreement is best understood in terms of divergent speaker-meanings, that it has specific negative effects on common ground, that it impedes collaborative action, and that it is likely to play a significant role in academic philosophy.</p>