Hemming and Hawing is an American expression for clearing you throat or making unintentional hesitation sounds (hmmm, uh, um, right? or m-ok, for example).  Many speakers do this without awareness. Once you are aware, what can you do about it? It's often not enough to just notice it. 

The solution is simple to  understand but can be difficult to implement consistently in practice. Rebecca Linquist explains the process in detail of physically closing the mouth so as not to allow breath to escape, eliminating the hemming and hawing, but also requiring other changes in your breath, self discipline and pre-planning with focused practice to ensure success when you are speaking naturally.

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