bury head in the sand

To avoid, or try to avoid, a particular situation by pretending that it does not exist. The phrase refers to the common but mistaken belief that ostriches bury their heads in the sand when frightened, so as to avoid being seen. Lou, you can't bury your head in the sand about your health—please, make an appointment with your doctor and get that rash checked out! A: "How has Peter been handling the break-up?" B: "Oh, just burying his head in the sand and ignoring his feelings."

Fig. to ignore or hide from obvious signs of danger. (Alludes to an ostrich, which is believed incorrectly to hide its head in a hole in the ground when it sees danger.) Stop burying your head in the sand. Look at the statistics on smoking and cancer.

To ignore danger, unpleasantness, or the like by pretending not to see it. The term comes from the practice of ostriches, who spend a good deal of time burrowing headfirst in the sand. Most of the time they are eating, for these large, flightless birds consume sand and gravel, which are used in their gizzards to help digest food. However, it was long thought that they put their heads down in the mistaken belief that they then cannot be seen, and from the early seventeenth century on this mythical self-delusion was transferred to human beings who are avoiding unpleasantness.