simple past tense and past participle of dip
"She dipped her hand into the cool water to wash off the dirt."
having abnormal sagging of the spine (especially in horses)
"The vet diagnosed my horse with a dipped back after noticing his spine was abnormally sagging when he stood still."
That has been briefly immersed in a liquid.
"She dipped her spoon into the bowl of soup before tasting it."