bird
the bird has flown the person you are looking for has escaped or gone away.
a bird in (the) hand something that you have securely or are sure of.
☞ This phrase refers to the proverb a bird in hand is worth two in the bush, current in English since the mid 15th century.
a bird of passage someone who is always moving on.
☞ Literally, a bird of passage is a migrant bird.
a bird's-eye view a general view from above.
the birds and the bees basic facts about sex and reproduction as told to a child. informal
birds of a feather people with similar tastes, interests, etc.
☞ This phrase comes from the proverb birds of a feather flock together, which has been current in this form since the late 16th century. Its origins may ultimately lie in the Apocrypha: 'the birds will resort unto their like' (Ecclesiasticus 27:9).
be a box of birds: seebox.
do bird serve a prison sentence. British informal
☞ In this phrase bird comes from rhyming slang birdlime 'time'.
early bird: seeearly.
flip someone the bird stick your middle finger up at someone as a sign of contempt or anger. informal, chiefly US
2019Sarah BaxterSunday Times In shock, he manages to walk stiffly from the wreckage. 'I'm such a fool,' he mutters, fearing the royal life of confinement has got him in the end. But not yet, dammit. As the credits roll, he flips the bird at his critics, clambers back into the driving seat of his replacement Land Rover and speeds off without a seatbelt.
give someone (or get) the bird boo or jeer at someone (or be booed or jeered at). British informal
☞ This phrase first appeared in early 19th-century theatrical slang as the big bird, meaning 'a goose'. This was because the hissing of geese could be compared to the audience's hissing at an act or actor of which it disapproved.
have a bird be very shocked or agitated. North American informal
1992Globe & Mail (Toronto) The Washington press corps would have a bird if the president-to-be appointed his wife to a real job.
kill two birds with one stone: seekill.
a little bird told me used as a teasing way of saying that you do not intend to divulge how you came to know something.
rare bird: seerare.
strictly for the birds not worth consideration; unimportant. informal
☞ This expression was originally US army slang. It may be an allusion to the way in which birds eat the droppings of horses and cattle.