be null and void

verb

Roget 2: not exist etc. 1; have no existence etc. 1; be null and void; cease to exist etc. 1; pass away, perish; be extinct, become extinct etc. adj.; die out; disappear etc. 449; melt away, dissolve, leave not a rack behind; go, be no more; die etc. 360.    annihilate, render null, nullify; abrogate etc. 756; destroy etc. 162; take away; remove etc. (displace) 185; obliterate, extirpate.    ... show more

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