put your head under the wing is incorrectly written and it should be written as "Cowardice." being its meaning: Cowardice. Not having the guts to deal with what comes up. Often is our own fault, negligence. Or simply, laziness. (To another do it / to. )
What not to do, in any case, is putting his head under the wing, like the ostrich, and wait for the storm to pass.