Brain wave and Out to lunch

Brain wave noun - (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph.

Out to lunch and brain wave are semantically related. In some cases you can use "Out to lunch" instead an adjective phrase "Brain wave".

Brain wave and out to lunch are semantically related. Sometimes you can use "Brain wave" instead an adjective phrase "Out to lunch".