to refuse to face up to unpleasant or awkward realities—refers to the practice traditionally attributed to the ostrich of thrusting its head into the sand when being overtaken by pursuers, supposedly through an incapacity to distinguish between seeing and being seen
the beard growth which becomes visible in the late afternoon on the face of a man who has shaved earlier in the day—originally (USA, 1937) the catchline of an advertising campaign for Gem Micromatic Razor and Blades
USA, 1888—used as a way of telling someone that they will have to accept a situation they do not like because they have no choice—the noun ‘titty’ denotes a teat, and, in the phrase, the image is of sucking a tough teat
to do or say something which causes trouble, controversy or upset—first occurs (1841 & 1843, Yorkshire, northern England) in quotation marks, which indicates that it was already in common usage
1607, as ‘as snug as pigs in pease-straw’—especially in ‘(as) snug as a bug in a rug’, phrases built on the pattern ‘(as) snug as [animal name] (in —)’ mean ‘in an extremely comfortable position or situation’
Australian soldiers’ slang, 1917—literally: to fall heavily; figuratively: to suffer a failure or defeat—‘gutser’ (Scotland, 1901): originally denoted a belly flop—derived from ‘gut’ in the sense of the belly
1922—‘like death warmed up’ (also ‘like death warmed over’): extended form of ‘like death’, attested in the mid-17th century and meaning ‘extremely ill’, or ‘exhausted’
1922, slang of high-school and university students in Kansas City (Missouri) and in Kansas: a fashionable young man who enjoys socialising with women at tea parties or other social events—1924: a diplomat employed by the U.S. State Department, regarded as being excessively occupied with entertaining dignitaries and doing little meaningful work