What is the meaning of Falter?

An unsteadiness.

To waver or be unsteady; to weaken or trail off.

To stammer; to utter with hesitation, or in a weak and trembling manner.

To fail in distinctness or regularity of exercise; said of the mind or of thought.

To stumble.

To lose faith or vigor; to doubt or abandon (a cause).

To hesitate in purpose or action.

To cleanse or sift, as barley.

Source: wiktionary.org