Something droops if it bends over and down. Things might droop because they are tired or unsupported. Some plants and flowers naturally have a drooping growth pattern.
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A drover is someone who drives livestock like cows or sheep from place to place. Drovers usually ride horses or motorbikes.
A drum is a percussion instrument, which means you hit it to make music. Drums are usually made from a round shell with a skin stretched tight over the top. How low or high the sound the drum makes depends on the size of the shell and how tight the skin is stretched.
A drum kit is a group of drums of different sizes put near each other so one person can play them at once.
