Dip
/dɪp/
noun
A lower section of a road or geological feature.
“There is a dip in the road ahead.”
Inclination downward; direction below a horizontal line; slope; pitch.
The action of dipping or plunging for a moment into a liquid.
verb
To lower into a liquid.
“Dip your biscuit into your tea.”
To immerse oneself; to become plunged in a liquid; to sink.
(of a value or rate) To decrease slightly.