Bird/bɜːrd/ Definition 1 of 5Pro Tip 1/3Bird Idioms Learn popular phrases like 'a little bird told me' to understand cultural uses. A little bird told me it's your birthday today! Pro Tip 2/3Bird Symbolism Birds often symbolize freedom or the natural world in literature and poetry. The caged bird sings of freedom. Pro Tip 3/3Bird Sounds Different birds make distinct sounds; 'tweet', 'squawk', 'hoot' describe these. At dawn, the birds tweet melodiously.