rule out

rule out  {v.}

1. To say that (something) must not be done; not allow; also: decide against.

The principal ruled out dances on school nights.

The play was ruled out by the referee.

Jean probably will not go to college, but she has not ruled that out.

2. To show that (someone or something) is not a possibility; make it unnecessary to think about; remove (a chance).

We have to find a baby-sitter for tonight; Betsy has a date, so that rules her out.

The doctor took X rays to rule out the chance of broken bones.

3. To make impossible; prevent.

Father's death seems to rule out college for Jean.