Fall back and Unsay

Fall back verb - To move back or away (as from something difficult, dangerous, or disagreeable).

Unsay and fall back are semantically related In some cases you can use "Unsay" instead a verb "Fall back".

Unsay verb - To solemnly or formally reject or go back on (as something formerly adhered to).

Fall back and unsay are semantically related in renege on topic. Sometimes you can use "Fall back" instead a verb "Unsay".