The bird began to cuckoo loudly in the early morning.
Птица начала громко куковать рано утром.
Definitions
To make the sound characteristic of a cuckoo bird.
Every morning, the clock would cuckoo at precisely 6 AM, waking everyone in the house.
To deposit eggs in the nest of (another bird), thereby getting the host to raise the offspring; figuratively, to foist one's responsibilities on someone else.
Brood-parasitic species like the common cuckoo will cuckoo another bird's nest and leave the chicks to be reared by the unsuspecting hosts.